We have an #ifdef EGL_WL_bind_wayland_display guard in
cogl-winsys-egl-feature-functions.h to avoid referencing wayland types
when the EGL header doesn't know about them, but somehow this guard also
ended up around the KHR_create_context and EXT_buffer age features too
even though they aren't wayland specific.
Reviewed-by: Neil Roberts <neil@linux.intel.com>