ddraw/tests: Fix alpha_test and offscreen_test on geforce 8800 on XP.

[Rico Schüller]

Hi,

this patch fixes the visual ddraw test on windows on geforce 8800. 
Probably other models are effected too.

Cheers
Rico
---
  dlls/ddraw/tests/visual.c |   18 ++++++++++++++++++
  1 files changed, 18 insertions(+), 0 deletions(-)


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