OpenXR: Fix support for building against distro package

modules/openxr/openxr_interface.cpp

@@ -36,7 +36,8 @@
 
 #include "extensions/openxr_eye_gaze_interaction.h"
 #include "extensions/openxr_hand_interaction_extension.h"
-#include "thirdparty/openxr/include/openxr/openxr.h"
+
+#include <openxr/openxr.h>
 
 void OpenXRInterface::_bind_methods() {
 	// lifecycle signals