quartz/tests: Skip some tests if not allowed to register filters.

[Marvin]

Hi,

While running your changed tests on Windows, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?
Full results can be found at
http://testbot.winehq.org/JobDetails.pl?Key=14367

Your paranoid android.


=== WNT4WSSP6 (32 bit filtermapper) ===
filtermapper.c:93: Test failed: CoCreateInstance failed with 80040154
filtermapper.c:230: Test failed: CoCreateInstance failed with 80040154
filtermapper.c:344: Test failed: CoCreateInstance failed with 80040154
filtermapper.c:402: Test failed: CoCreateInstance failed with 80040154