Fix program for GStreamer < 0.10.31
Fix program for GStreamer < 0.10.31

It seems that gst_is_initialized() wasn't added until version 0.10.31.
And it just so happens that Ubuntu 10.10 has 0.10.30, so compilation
was failing.

wmvanvliet/Chimara,wmvanvliet/Chimara,wmvanvliet/Chimara,wmvanvliet/Chimara,wmvanvliet/Chimara