[1/2][try 3] ddraw/tests: add test for rendering vertices with zero rhw

[Alexander Dorofeyev]

Hi.

I couldn't reproduce any problems with this patch on wine or on windows, but I
moved coordinates of retrieved pixel a bit away from edges. I hope this was the
problem :-/

Alexandre Julliard wrote:
  > This is failing occasionally here:
  >
  > ../../../tools/runtest -q -P wine -M ddraw.dll -T ../../.. -p
ddraw_test.exe.so visual.c && touch visual.ok
  > visual.c:797: Test failed: Got color 00000000, expected 00ffffff
  > make: *** [visual.ok] Error 1
  >
---
        dlls/ddraw/tests/visual.c |   41 +++++++++++++++++++++++++++++++++++++++++
        1 files changed, 41 insertions(+), 0 deletions(-)






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