glcontext/eagl: handle sending one message during shutdown
gst_gl_window_quit() will attempt to send a message but will be called
from GstGLContext's finalize handler and so the weak ref that backs
gst_gl_window_get_context will return NULL as it has already been
cleared. We need that context in send_message_async to decide whether
to run the provided callback immediately or queue in GCD
This is the equivalent commit for iOS as:
7f59cefafb1cd733cf527fb935b2cd32418fcbe2
https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/618
Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/681>