package/yasm: fix build with host GCC 15

Fix the following autobuild error that started appearing with host GCC15
configs.

```
/usr/bin/gcc -DHAVE_CONFIG_H -I.   -I/workdir/instance-0/output-1/host/include  -O2 -I/workdir/instance-0/output-1/host/include  -c -o modules/arch/x86/x86arch.o modules/arch/x86/x86arch.c
In file included from modules/arch/x86/x86arch.h:30,
                 from modules/arch/x86/x86arch.c:31:
./libyasm/bitvect.h:86:32: error: cannot use keyword 'false' as enumeration constant
   86 |         typedef enum boolean { false = FALSE, true = TRUE } boolean;
      |                                ^~~~~
./libyasm/bitvect.h:86:32: note: 'false' is a keyword with '-std=c23' onwards
```

This is due to the change in the default C language version in GCC15.

Fixes: https://autobuild.buildroot.org/results/d1d/d1d9a6e73c2ec278941dd90c6b07cce01b372feb/

Signed-off-by: Thomas Perale <thomas.perale@mind.be>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/yasm/0002-bitvect-fix-build-with-gcc-15.patch

@@ -0,0 +1,38 @@
+From 64ef740eb262f329e55eebadf2ce276b146d44e9 Mon Sep 17 00:00:00 2001
+From: Martin Jansa <martin.jansa@gmail.com>
+Date: Tue, 22 Apr 2025 19:06:24 +0200
+Subject: [PATCH] bitvect: fix build with gcc-15
+
+* fixes:
+libyasm/bitvect.h:86:32: error: cannot use keyword 'false' as enumeration constant
+   86 |         typedef enum boolean { false = FALSE, true = TRUE } boolean;
+      |                                ^~~~~
+../git/libyasm/bitvect.h:86:32: note: 'false' is a keyword with '-std=c23' onwards
+
+as suggested in:
+https://github.com/yasm/yasm/issues/283#issuecomment-2661108816
+
+Signed-off-by: Martin Jansa <martin.jansa@gmail.com>
+Upstream: https://github.com/yasm/yasm/pull/287
+Signed-off-by: Thomas Perale <thomas.perale@mind.be>
+---
+ libyasm/bitvect.h | 6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+diff --git a/libyasm/bitvect.h b/libyasm/bitvect.h
+index 3aee3a531..a13470ada 100644
+--- a/libyasm/bitvect.h
++++ b/libyasm/bitvect.h
+@@ -83,7 +83,11 @@ typedef  Z_longword         *Z_longwordptr;
+     #ifdef MACOS_TRADITIONAL
+         #define boolean Boolean
+     #else
+-        typedef enum boolean { false = FALSE, true = TRUE } boolean;
++        #if __STDC_VERSION__ < 202311L
++             typedef enum boolean { false = FALSE, true = TRUE } boolean;
++        #else
++             typedef bool boolean;
++        #endif
+     #endif
+ #endif
+