[Bug 611692] Add more warning flags

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=611692
  GStreamer | gstreamer (core) | git

Bug 611692 depends on bug 624001, which changed state.

Bug 624001 Summary: Support attribute-based method to deprecate symbols
https://bugzilla.gnome.org/show_bug.cgi?id=624001

           What    |Old Value                   |New Value
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

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