tracker-extract-gstreamer: Remove check for GST_VERSION > 0.10.20
tracker-extract-gstreamer: Remove check for GST_VERSION > 0.10.20

Tracker now requires at least 0.10.30 in any case.

outofbits/tracker,outofbits/tracker,hoheinzollern/tracker,hoheinzollern/tracker,hoheinzollern/tracker,outofbits/tracker,hoheinzollern/tracker,hoheinzollern/tracker,outofbits/tracker,hoheinzollern/tracker,outofbits/tracker,outofbits/tracker,outofbits/tracker,hoheinzollern/tracker