[1/3] DDraw: Make the ddraw list lock a global dll lock

[Stefan Dösinger]

These are the first 3 patches with another attempt to make DDraw thread safe. 
They follow the idea I outlined a few days ago on wine-devel:

http://www.winehq.org/pipermail/wine-devel/2007-May/056930.html

This is a first preperation patch.
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