[Bug 774293] msvc: fix some warnings, disable others

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=774293

Tim-Philipp Müller <t.i.m at zen.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |t.i.m at zen.co.uk

--- Comment #17 from Tim-Philipp Müller <t.i.m at zen.co.uk> ---
With gcc g_once_init_{enter,leave} is just a macro and there's a (gpointer)
cast which makes the const go away.

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