render/vulkan: quiet glslangValidator

This suppresses the output filename printed to stdout. Errors and
warnings should still be printed to stderr as usual.

render/vulkan/meson.build

@@ -33,6 +33,9 @@ if not glslang.found()
 	endif
 endif
 
+glslang_version_info = run_command(glslang, '--version', check: true).stdout()
+glslang_version = glslang_version_info.split('\n')[0].split(':')[-1]
+
 wlr_files += files(
 	'renderer.c',
 	'texture.c',

render/vulkan/shaders/meson.build

@@ -8,6 +8,9 @@ vulkan_shaders = []
 foreach shader : vulkan_shaders_src
 	name = shader.underscorify() + '_data'
 	args = [glslang, '-V', '@INPUT@', '-o', '@OUTPUT@', '--vn', name]
+	if glslang_version.version_compare('>=11.0.0')
+		args += '--quiet'
+	endif
 	header = custom_target(
 		shader + '_spv',
 		output: shader + '.h',