[Bug 39171] Creatures: White pixels are black.

https://bugs.winehq.org/show_bug.cgi?id=39171

--- Comment #8 from Richard  ---
Anton's (CC'd) patch is a better implementation then mine.

Only problem I see with it is that GetSystemPaletteEntries should provide the
system colors even when the passed DC is NULL.

Creatures isn't doing this but it's something I came across in my testing of
it. The test application source I attached would fail with it.