render/vulkan: use renamed glslang binary by default

glslang 12.3.0 renamed glslangValidator to glslang,
use that by default and use the old name as a fallback.

References: https://github.com/KhronosGroup/glslang/blob/main/CHANGES.md?plain=1#L14

render/vulkan/meson.build

@@ -24,7 +24,7 @@ if not cc.check_header('vulkan/vulkan.h', dependencies: dep_vulkan)
 	endif
 endif
 
-glslang = find_program('glslangValidator', native: true, required: false)
+glslang = find_program('glslang', 'glslangValidator', native: true, required: false)
 if not glslang.found()
 	if 'vulkan' in renderers
 		error('\n'.join(msg).format('glslang'))