[Bug 657638] Update introspection.m4 from upstream

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=657638
  GStreamer | common | unspecified

Tim-Philipp Müller <t.i.m> changed:

           What    |Removed                     |Added
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                 CC|                            |t.i.m at zen.co.uk
   Target Milestone|HEAD                        |NONE

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