[Bug 747869] gstutils: silence clang's -Wcast-align

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=747869

--- Comment #5 from Michael Catanzaro <mcatanzaro at gnome.org> ---
Based on [1] I guess MSVC would give a warning, so let's add #ifdefs to be on
the safe side.

[1] https://msdn.microsoft.com/en-us/library/d9x1s805.aspx

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