build: drop wayland-scanner fallback

protocols/meson.build

@@ -1,14 +1,10 @@
 wl_protocol_dir = wayland_protos.get_variable('pkgdatadir')
 
-wayland_scanner_dep = dependency('wayland-scanner', required: false, native: true)
+wayland_scanner_dep = dependency('wayland-scanner', native: true)
-if wayland_scanner_dep.found()
 wayland_scanner = find_program(
 	wayland_scanner_dep.get_variable(pkgconfig: 'wayland_scanner'),
 	native: true,
 )
-else
-	wayland_scanner = find_program('wayland-scanner', native: true)
-endif
 
 protocols = [
 	wl_protocol_dir / 'stable/xdg-shell/xdg-shell.xml',