[Bug 657638] Update introspection.m4 from upstream

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=657638
  GStreamer | gstreamer (core) | unspecified

David Schleef <ds> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|High                        |Normal
             Status|NEEDINFO                    |NEW
           Severity|critical                    |normal

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