package/localedef: fix gcc-10.0.1 compile

Fixes build woth gcc-10, by backporting an upstream patch:

  programs/ld-ctype.c:855:18: error: array subscript 0 is outside the bounds of an interior zero-length array ‘unsigned char[0]’ [-Werror=zero-length-bounds]
    855 |  replace[0].bytes[0] = '?';
        |  ~~~~~~~~~~~~~~~~^~~

Fixes: #12711

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
[yann.morin.1998@free.fr: slight reword in commit log]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/localedef/2.30-20-g50f20fe506abb8853641006a7b90a81af21d7b91/0003-localedef-Use-initializer-for-flexible-array-member-.patch

@@ -0,0 +1,81 @@
+From 6fea0a8e33760258c4baa5d0a6f3a145897427fe Mon Sep 17 00:00:00 2001
+From: Florian Weimer <fweimer@redhat.com>
+Date: Tue, 3 Sep 2019 14:01:39 +0200
+Subject: [PATCH] localedef: Use initializer for flexible array member [BZ
+ #24950]
+
+struct charseq used a zero-length array instead of a flexible array
+member.  This required a strange construct to initialize struct
+charseq objects, and GCC 10 warns about that:
+
+cc1: error: writing 1 byte into a region of size 0 [-Werror=stringop-overflow=]
+In file included from programs/repertoire.h:24,
+                 from programs/localedef.h:32,
+                 from programs/ld-ctype.c:35:
+programs/charmap.h:63:17: note: destination object declared here
+   63 |   unsigned char bytes[0];
+      |                 ^~~~~
+cc1: error: writing 1 byte into a region of size 0 [-Werror=stringop-overflow=]
+programs/charmap.h:63:17: note: destination object declared here
+cc1: error: writing 1 byte into a region of size 0 [-Werror=stringop-overflow=]
+programs/charmap.h:63:17: note: destination object declared here
+cc1: error: writing 1 byte into a region of size 0 [-Werror=stringop-overflow=]
+programs/charmap.h:63:17: note: destination object declared here
+
+The change makes the object physically const, but it is not expected
+to be modified.
+
+[Upstream: https://sourceware.org/git/?p=glibc.git;a=patch;h=1471fa556afb428c4a4c46cf5543a4101d5bcf91]
+[Dropped confliciting ChangeLog part]
+Signed-off-by: Peter Seiderer <ps.report@gmx.net>
+---
+ locale/programs/charmap.h  |  2 +-
+ locale/programs/ld-ctype.c | 12 ++++++------
+ 2 files changed, 7 insertions(+), 7 deletions(-)
+
+diff --git a/locale/programs/charmap.h b/locale/programs/charmap.h
+index 870a9e95..70db330d 100644
+--- a/locale/programs/charmap.h
++++ b/locale/programs/charmap.h
+@@ -60,7 +60,7 @@ struct charseq
+   const char *name;
+   uint32_t ucs4;
+   int nbytes;
+-  unsigned char bytes[0];
++  unsigned char bytes[];
+ };
+ 
+ 
+diff --git a/locale/programs/ld-ctype.c b/locale/programs/ld-ctype.c
+index cfc9c43f..9123f64a 100644
+--- a/locale/programs/ld-ctype.c
++++ b/locale/programs/ld-ctype.c
+@@ -842,8 +842,6 @@ no input digits defined and none of the standard names in the charmap"));
+   for (cnt = 0; cnt < 10; ++cnt)
+     if (ctype->mboutdigits[cnt] == NULL)
+       {
+-	static struct charseq replace[2];
+-
+ 	if (!warned)
+ 	  {
+ 	    record_error (0, 0, _("\
+@@ -851,10 +849,12 @@ not all characters used in `outdigit' are available in the charmap"));
+ 	    warned = 1;
+ 	  }
+ 
+-	replace[0].nbytes = 1;
+-	replace[0].bytes[0] = '?';
+-	replace[0].bytes[1] = '\0';
+-	ctype->mboutdigits[cnt] = &replace[0];
++	static const struct charseq replace =
++	  {
++	     .nbytes = 1,
++	     .bytes = "?",
++	  };
++	ctype->mboutdigits[cnt] = (struct charseq *) &replace;
+       }
+ 
+   warned = 0;
+-- 
+2.26.0
+