gstreamer/testsuite/caps/compatibility fails on 6 <-> 7.  This is also a
problem for 0.6.x, and is causing problems for videotestsrc and videoscale.

4 <-> 2 == 0 (invalid, wrong major type)
4 <-> 1 == 1 (valid, subset)
1 <-> 4 == 0 (invalid, superset)
2 <-> 3 == 0 (invalid, ranges)
2 <-> 5 == 1 (valid)
5 <-> 2 == 0 (invalid)
3 <-> 5 == 1 (valid)
3 <-> 2 == 0 (invalid, property missing in source)
2 <-> 2 == 1 (valid, same caps)
6 <-> 7 == 1 (invalid, second caps doesn't fit)

           ^ should be 0