[PATCH] ddraw/tests: Only set DDSCAPS_OVERLAY if supported.

[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
https://newtestbot.winehq.org/JobDetails.pl?Key=5559

Your paranoid android.


=== w8 (32 bit ddraw7) ===
The test timed out

=== w8 (32 bit ddraw4) ===
The test timed out