OpenXR: Fix building with Wayland support and opengl3=no

Author: dsnopek

modules/openxr/SCsub

@@ -27,7 +27,7 @@ elif env["platform"] == "linuxbsd":
     if env["x11"]:
         env_openxr.AppendUnique(CPPDEFINES=["XR_USE_PLATFORM_XLIB"])
 
-    if env["wayland"]:
+    if env["wayland"] and env["opengl3"]:
         env_openxr.AppendUnique(CPPDEFINES=["XR_USE_PLATFORM_EGL"])
 
     # FIXME: Review what needs to be set for Android and macOS.