[d3d8] Fix CreateImageSurface implementation (with testcase)

[Tobias Jakobi]

Patch fixes a problem with the IDirect3DDevice8::CreateImageSurface 
implementation (wrong pool type of the returned surface object). This 
fixes savegame screenshot bugs (black images instead of game scenes) in 
both Max Payne and Max Payne 2.

Affected bugs:
http://bugs.winehq.org/show_bug.cgi?id=9775
http://bugs.winehq.org/show_bug.cgi?id=7801

Test case is included and verifies behaviour on both Windows XP and Vista.
This is my first patch for wine and also my first post on the 
wine-patches ml, so if I'm doing anything wrong here please tell me and 
I try to do better next time :-)

Greets,
Tobias Jakobi

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