When the user called eglCreateSync64KHR on a display without
EGL_KHR_cl_event2 (the only extension that exposes it), we returned
EGL_NO_SYNC but did not update the error code.
We also did the same for eglCreateSync on a display without EGL 1.5.
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>