[Bug 749601] win32: glimagesink always popup a new window

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=749601

--- Comment #10 from Xavier Claessens <xclaesse at gmail.com> ---
Created attachment 303717
  --> https://bugzilla.gnome.org/attachment.cgi?id=303717&action=edit
gl: win32: fix crash when finalizing GstGLContext

gst_gl_context_finalize() is calling gst_gl_window_win32_quit()
which was posting a message. But then window_proc takes window's
context and get a NULL.

Now that we've got a GMainLoop we can do like other backends and
simply call g_main_loop_quit().

This also remove duplicated code to release the parent window and
potential crash there because parent_proc could be NULL if we never
created the internal window. That could happen for example if setting
state to READY then setting a window_handle, and go back to NULL state.

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