package/libid3tag: needs autoreconf

libid3tag uses a very old configure script.

When the toolchain lacks C++ and the build machine lacks /lib/cpp, this
old configure script fails because it can't find a C++ preprocessor that
is valid:

    checking for arm-buildroot-linux-uclibcgnueabi-g++... no
    checking whether we are using the GNU C++ compiler... no
    checking whether no accepts -g... no
    checking dependency style of no... none
    checking how to run the C++ preprocessor... /lib/cpp
    configure: error: C++ preprocessor "/lib/cpp" fails sanity check
    See `config.log' for more details.

This is yet another case that was tentatively fixed by bd39d11d2e
(core/infra: fix build on toolchain without C++), further amended by
4cd1ab15886 (core: alternate solution to disable C++).

However, this only works on libtool scripts that are recent enough, and
thus we need to autoreconf to get it.

We also need to patch configure.ac so that it does not fail on the
missing, GNU-specific files: NEWS, AUTHORS, and Changelog.

Fixes:
    http://autobuild.buildroot.org/results/ac3/ac3870208aab6001db6b790b6c5dde64d08f7669/
    http://autobuild.buildroot.org/results/cc1/cc18397f38dfd4f1e6605f7a6f58edab49b396ac/

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/libid3tag/0001-configure-automake-foreign.patch

@@ -0,0 +1,16 @@
+configure: don't require GNU-specific files when running automake
+
+Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
+
+diff -durN libid3tag-0.15.1b.orig/configure.ac libid3tag-0.15.1b/configure.ac
+--- libid3tag-0.15.1b.orig/configure.ac	2004-01-24 00:22:46.000000000 +0100
++++ libid3tag-0.15.1b/configure.ac	2018-11-25 15:31:04.184342212 +0100
+@@ -26,7 +26,7 @@
+ 
+ AC_CONFIG_SRCDIR([id3tag.h])
+ 
+-AM_INIT_AUTOMAKE
++AM_INIT_AUTOMAKE([foreign])
+ 
+ AM_CONFIG_HEADER([config.h])
+ 

package/libid3tag/libid3tag.mk

@@ -10,6 +10,9 @@ LIBID3TAG_LICENSE = GPL-2.0+
 LIBID3TAG_LICENSE_FILES = COPYING COPYRIGHT
 LIBID3TAG_INSTALL_STAGING = YES
 LIBID3TAG_DEPENDENCIES = zlib
-LIBID3TAG_LIBTOOL_PATCH = NO
+
+# Force autoreconf to be able to use a more recent libtool script, that
+# is able to properly behave in the face of a missing C++ compiler.
+LIBID3TAG_AUTORECONF = YES
 
 $(eval $(autotools-package))