configure: Remove wayland-protocols check from configure and CMake scripts.

We ship these with SDL now, don't need the system versions installed.

cmake/sdlchecks.cmake

@@ -593,7 +593,7 @@ endmacro()
 # - HAVE_DLOPEN opt
 macro(CheckWayland)
   if(VIDEO_WAYLAND)
-    pkg_check_modules(WAYLAND wayland-client wayland-scanner wayland-protocols wayland-egl wayland-cursor egl xkbcommon)
+    pkg_check_modules(WAYLAND wayland-client wayland-scanner wayland-egl wayland-cursor egl xkbcommon)
 
     if(WAYLAND_FOUND)
       execute_process(