[Bug 675600] dshowvideosink: Add missing cast to LPCSTR

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=675600
  GStreamer | gst-plugins-bad | 0.10.x

Sebastian Dröge <slomo> changed:

           What    |Removed                     |Added
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 Attachment #213576|none                        |committed
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