[1/5] DDraw: Add a test for EnumSurfaces

[Stefan Dösinger]

The next few patches aim at supporting cube textures in d3d7. They require 
changing the ddraw surface attachment structure from a list to a tree. To 
make this easier I will start by removing some code that directly accesses 
the lists.

For 99% the tree degenerates to a linked list, except for cube texture roots. 
Tests for this will follow too
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