[Bug 797184] gl/win32: Use g_io_channel_win32_new_messages() instead of our custom GSource

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797184

--- Comment #3 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Confirmed to compile at least

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