xwayland: use internal_config

Avoids the need to have a separate config.h, and removes C compiler
arguments.

include/meson.build

@@ -13,8 +13,6 @@ if not features.get('x11-backend')
 endif
 if not features.get('xwayland')
 	exclude_files += 'xwayland.h'
-else
-	subdir('xwayland')
 endif
 if not features.get('gles2-renderer')
 	exclude_files += ['render/egl.h', 'render/gles2.h']

include/xwayland/meson.build

@@ -1,30 +0,0 @@
-xwayland_feature_names = [
-	'listenfd',
-	'no_touch_pointer_emulation',
-	'force_xrandr_emulation',
-	'terminate_delay',
-]
-
-xwayland_features = {}
-if xwayland.found()
-	xwayland_path = xwayland.get_variable('xwayland')
-	foreach name : xwayland_feature_names
-		have = xwayland.get_variable('have_' + name, default_value: 'false') == 'true'
-		xwayland_features += { name: have }
-	endforeach
-else
-	xwayland_path = xwayland_prog.full_path()
-	foreach name : xwayland_feature_names
-		xwayland_features += { name: false }
-	endforeach
-endif
-
-xwayland_config_data = configuration_data()
-xwayland_config_data.set_quoted('XWAYLAND_PATH', xwayland_path)
-foreach name, have : xwayland_features
-	xwayland_config_data.set10('HAVE_XWAYLAND_' + name.to_upper(), have)
-endforeach
-configure_file(
-	output: 'config.h',
-	configuration: xwayland_config_data,
-)