Fix C compatibility issue in Meson probe

Related to:

  <https://fedoraproject.org/wiki/Changes/PortingToModernC>
  <https://fedoraproject.org/wiki/Toolchain/PortingToModernC>

mesa-meson-c99.patch

@@ -0,0 +1,42 @@
+meson: C type error in strtod_l/strtof_l probe
+
+Future compilers will fail compilation due to the C type error:
+
+…/testfile.c: In function 'main':
+…/testfile.c:12:30: error: passing argument 2 of 'strtod_l' from incompatible pointer type
+   12 |       double d = strtod_l(s, end, loc);
+      |                              ^~~
+      |                              |
+      |                              char *
+/usr/include/stdlib.h:416:43: note: expected 'char ** restrict' but argument is of type 'char *'
+  416 |                         char **__restrict __endptr, locale_t __loc)
+      |                         ~~~~~~~~~~~~~~~~~~^~~~~~~~
+…/testfile.c:13:29: error: passing argument 2 of 'strtof_l' from incompatible pointer type
+   13 |       float f = strtof_l(s, end, loc);
+      |                             ^~~
+      |                             |
+      |                             char *
+/usr/include/stdlib.h:420:42: note: expected 'char ** restrict' but argument is of type 'char *'
+  420 |                        char **__restrict __endptr, locale_t __loc)
+      |                        ~~~~~~~~~~~~~~~~~~^~~~~~~~
+
+This means that the probe no longer tests is objective and always
+fails.
+
+Submitted upstream: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26927>
+
+diff --git a/meson.build b/meson.build
+index 35cc5f1cd5fd9079..1a5d2ba492be0b31 100644
+--- a/meson.build
++++ b/meson.build
+@@ -1425,8 +1425,8 @@ if cc.links('''
+       locale_t loc = newlocale(LC_CTYPE_MASK, "C", NULL);
+       const char *s = "1.0";
+       char *end;
+-      double d = strtod_l(s, end, loc);
+-      float f = strtof_l(s, end, loc);
++      double d = strtod_l(s, &end, loc);
++      float f = strtof_l(s, &end, loc);
+       freelocale(loc);
+       return 0;
+     }''',

mesa.spec

@@ -77,6 +77,7 @@ Patch10:        gnome-shell-glthread-disable.patch
 Patch11:        0001-intel-compiler-reemit-boolean-resolve-for-inverted-i.patch
 Patch12:        0001-intel-compiler-fix-release-build-unused-variable.patch
 Patch13:        disable-zink-egl-fallback.patch
+Patch14: mesa-meson-c99.patch
 
 BuildRequires:  meson >= 1.2.0
 BuildRequires:  gcc