Log Message:
With the gstreamer option enabled, pidgin looks for GSTINTERFACES, provided
by multimedia/gst-plugins0.10-base.  Even if it doesn't find what it's
looking for, it still has a tendency to attempt to link in gstinterfaces-0.10,
which fails.  Fix this by buildlinking in multimedia/gst-plugins0.10-base.

Bump PKGREVISION, since gstreamer is a default option and there is possibly
something not quite right about versions of this package where the build
was successful without the apparently required buildlinking.