meson: prog_glslang should always be for the build machine

It doesn't produce different code when compiled for the host machine,
and this avoids needing two copies and possibly a host machine emulator
in cross compilation settings

Reviewed-by: Luis Felipe Strano Moraes <luis.strano@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19449>

meson.build

@@ -686,7 +686,7 @@ if vdpau_drivers_path == ''
 endif
 
 if with_vulkan_overlay_layer or with_aco_tests or with_amd_vk
-  prog_glslang = find_program('glslangValidator')
+  prog_glslang = find_program('glslangValidator', native : true)
   if run_command(prog_glslang, [ '--quiet', '--version' ], check : false).returncode() == 0
     glslang_quiet = ['--quiet']
   else