gzip: fix build with glibc 2.28

Apply the patch taken from OpenEmbedded:
https://patches.openembedded.org/patch/153323/

The patch handles glibc 2.28 libio.h removal.

Fixes:
http://autobuild.buildroot.net/results/69c5c5a3ec7fb320959f1788f1b6d5a99cfc50b1

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/gzip/0001-fflush-adjust-to-glibc-2.28-libio.h-removal.patch

@@ -0,0 +1,189 @@
+From 1831628c0630ae96a43586b2a25ca51cbdba3e53 Mon Sep 17 00:00:00 2001
+From: Paul Eggert <address@hidden>
+Date: Mon, 5 Mar 2018 10:56:29 -0800
+Subject: [PATCH] fflush: adjust to glibc 2.28 libio.h removal
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Problem reported by Daniel P. Berrange in:
+https://lists.gnu.org/r/bug-gnulib/2018-03/msg00000.html
+* lib/fbufmode.c (fbufmode):
+* lib/fflush.c (clear_ungetc_buffer_preserving_position)
+(disable_seek_optimization, rpl_fflush):
+* lib/fpending.c (__fpending):
+* lib/fpurge.c (fpurge):
+* lib/freadable.c (freadable):
+* lib/freadahead.c (freadahead):
+* lib/freading.c (freading):
+* lib/freadptr.c (freadptr):
+* lib/freadseek.c (freadptrinc):
+* lib/fseeko.c (fseeko):
+* lib/fseterr.c (fseterr):
+* lib/fwritable.c (fwritable):
+* lib/fwriting.c (fwriting):
+Check _IO_EOF_SEEN instead of _IO_ftrylockfile.
+* lib/stdio-impl.h (_IO_IN_BACKUP) [_IO_EOF_SEEN]:
+Define if not already defined.
+---
+
+Upstream-Status: Pending
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
+
+ ChangeLog        | 23 +++++++++++++++++++++++
+ lib/fbufmode.c   |  2 +-
+ lib/fflush.c     |  6 +++---
+ lib/fpending.c   |  2 +-
+ lib/fpurge.c     |  2 +-
+ lib/freadable.c  |  2 +-
+ lib/freadahead.c |  2 +-
+ lib/freading.c   |  2 +-
+ lib/freadptr.c   |  2 +-
+ lib/freadseek.c  |  2 +-
+ lib/fseeko.c     |  4 ++--
+ lib/fseterr.c    |  2 +-
+ lib/fwritable.c  |  2 +-
+ lib/fwriting.c   |  2 +-
+ lib/stdio-impl.h |  6 ++++++
+ 15 files changed, 45 insertions(+), 16 deletions(-)
+
+Index: gzip-1.9/ChangeLog
+===================================================================
+--- gzip-1.9.orig/ChangeLog
++++ gzip-1.9/ChangeLog
+@@ -1,3 +1,26 @@
++2018-03-05  Paul Eggert  <address@hidden>
++
++	fflush: adjust to glibc 2.28 libio.h removal
++	Problem reported by Daniel P. Berrange in:
++	https://lists.gnu.org/r/bug-gnulib/2018-03/msg00000.html
++	* lib/fbufmode.c (fbufmode):
++	* lib/fflush.c (clear_ungetc_buffer_preserving_position)
++	(disable_seek_optimization, rpl_fflush):
++	* lib/fpending.c (__fpending):
++	* lib/fpurge.c (fpurge):
++	* lib/freadable.c (freadable):
++	* lib/freadahead.c (freadahead):
++	* lib/freading.c (freading):
++	* lib/freadptr.c (freadptr):
++	* lib/freadseek.c (freadptrinc):
++	* lib/fseeko.c (fseeko):
++	* lib/fseterr.c (fseterr):
++	* lib/fwritable.c (fwritable):
++	* lib/fwriting.c (fwriting):
++	Check _IO_EOF_SEEN instead of _IO_ftrylockfile.
++	* lib/stdio-impl.h (_IO_IN_BACKUP) [_IO_EOF_SEEN]:
++	Define if not already defined.
++
+ 2018-01-07  Jim Meyering  <meyering@fb.com>
+
+	version 1.9
+Index: gzip-1.9/lib/fflush.c
+===================================================================
+--- gzip-1.9.orig/lib/fflush.c
++++ gzip-1.9/lib/fflush.c
+@@ -33,7 +33,7 @@
+ #undef fflush
+
+
+-#if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
++#if defined _IO_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
+
+ /* Clear the stream's ungetc buffer, preserving the value of ftello (fp).  */
+ static void
+@@ -72,7 +72,7 @@ clear_ungetc_buffer (FILE *fp)
+
+ #endif
+
+-#if ! (defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */)
++#if ! (defined _IO_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */)
+
+ # if (defined __sferror || defined __DragonFly__ || defined __ANDROID__) && defined __SNPT
+ /* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin, Minix 3, Android */
+@@ -148,7 +148,7 @@ rpl_fflush (FILE *stream)
+   if (stream == NULL || ! freading (stream))
+     return fflush (stream);
+
+-#if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
++#if defined _IO_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
+
+   clear_ungetc_buffer_preserving_position (stream);
+
+Index: gzip-1.9/lib/fpurge.c
+===================================================================
+--- gzip-1.9.orig/lib/fpurge.c
++++ gzip-1.9/lib/fpurge.c
+@@ -62,7 +62,7 @@ fpurge (FILE *fp)
+   /* Most systems provide FILE as a struct and the necessary bitmask in
+      <stdio.h>, because they need it for implementing getc() and putc() as
+      fast macros.  */
+-# if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
++# if defined _IO_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
+   fp->_IO_read_end = fp->_IO_read_ptr;
+   fp->_IO_write_ptr = fp->_IO_write_base;
+   /* Avoid memory leak when there is an active ungetc buffer.  */
+Index: gzip-1.9/lib/freading.c
+===================================================================
+--- gzip-1.9.orig/lib/freading.c
++++ gzip-1.9/lib/freading.c
+@@ -31,7 +31,7 @@ freading (FILE *fp)
+   /* Most systems provide FILE as a struct and the necessary bitmask in
+      <stdio.h>, because they need it for implementing getc() and putc() as
+      fast macros.  */
+-# if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
++# if defined _IO_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
+   return ((fp->_flags & _IO_NO_WRITES) != 0
+           || ((fp->_flags & (_IO_NO_READS | _IO_CURRENTLY_PUTTING)) == 0
+               && fp->_IO_read_base != NULL));
+Index: gzip-1.9/lib/fseeko.c
+===================================================================
+--- gzip-1.9.orig/lib/fseeko.c
++++ gzip-1.9/lib/fseeko.c
+@@ -47,7 +47,7 @@ fseeko (FILE *fp, off_t offset, int when
+ #endif
+
+   /* These tests are based on fpurge.c.  */
+-#if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
++#if defined _IO_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
+   if (fp->_IO_read_end == fp->_IO_read_ptr
+       && fp->_IO_write_ptr == fp->_IO_write_base
+       && fp->_IO_save_base == NULL)
+@@ -123,7 +123,7 @@ fseeko (FILE *fp, off_t offset, int when
+           return -1;
+         }
+
+-#if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
++#if defined _IO_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
+       fp->_flags &= ~_IO_EOF_SEEN;
+       fp->_offset = pos;
+ #elif defined __sferror || defined __DragonFly__ || defined __ANDROID__
+Index: gzip-1.9/lib/fseterr.c
+===================================================================
+--- gzip-1.9.orig/lib/fseterr.c
++++ gzip-1.9/lib/fseterr.c
+@@ -29,7 +29,7 @@ fseterr (FILE *fp)
+   /* Most systems provide FILE as a struct and the necessary bitmask in
+      <stdio.h>, because they need it for implementing getc() and putc() as
+      fast macros.  */
+-#if defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
++#if defined _IO_EOF_SEEN || __GNU_LIBRARY__ == 1 /* GNU libc, BeOS, Haiku, Linux libc5 */
+   fp->_flags |= _IO_ERR_SEEN;
+ #elif defined __sferror || defined __DragonFly__ || defined __ANDROID__
+   /* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin, Minix 3, Android */
+Index: gzip-1.9/lib/stdio-impl.h
+===================================================================
+--- gzip-1.9.orig/lib/stdio-impl.h
++++ gzip-1.9/lib/stdio-impl.h
+@@ -18,6 +18,12 @@
+    the same implementation of stdio extension API, except that some fields
+    have different naming conventions, or their access requires some casts.  */
+
++/* Glibc 2.28 made _IO_IN_BACKUP private.  For now, work around this
++   problem by defining it ourselves.  FIXME: Do not rely on glibc
++   internals.  */
++#if !defined _IO_IN_BACKUP && defined _IO_EOF_SEEN
++# define _IO_IN_BACKUP 0x100
++#endif
+
+ /* BSD stdio derived implementations.  */