ports(mesa): define GNU_SOURCE to fix compilation

Signed-off-by: Anhad Singh <[email protected]>

Author: Andy-Python-Programmer

patches/mesa/jinx-working-patch.patch

@@ -11,6 +11,19 @@ index 0254024..c2ffd35 100644
  #include <sys/types.h>
  typedef int8_t   __s8;
  typedef uint8_t  __u8;
+diff --git mesa-clean/meson.build mesa-workdir/meson.build
+index 2902c10..1da7605 100644
+--- mesa-clean/meson.build
++++ mesa-workdir/meson.build
+@@ -959,7 +959,7 @@ if cc.has_function('fmemopen')
+ endif
+ 
+ # TODO: this is very incomplete
+-if ['linux', 'cygwin', 'gnu', 'freebsd', 'gnu/kfreebsd', 'haiku', 'android'].contains(host_machine.system())
++if ['linux', 'cygwin', 'gnu', 'freebsd', 'gnu/kfreebsd', 'haiku', 'android', 'aero'].contains(host_machine.system())
+   pre_args += '-D_GNU_SOURCE'
+ elif host_machine.system() == 'sunos'
+   pre_args += '-D__EXTENSIONS__'
 diff --git mesa-clean/src/compiler/spirv/spirv_to_nir.c mesa-workdir/src/compiler/spirv/spirv_to_nir.c
 index 5f36118..a501802 100644
 --- mesa-clean/src/compiler/spirv/spirv_to_nir.c