Move OpenXR project settings to the main, to make them visible on unsupported platforms.

modules/openxr/openxr_api.h

@@ -222,7 +222,6 @@ protected:
 	void parse_velocities(const XrSpaceVelocity &p_velocity, Vector3 &r_linear_velocity, Vector3 r_angular_velocity);
 
 public:
-	static void setup_global_defs();
 	static bool openxr_is_enabled();
 	static OpenXRAPI *get_singleton();