Fix regression in ddraw/surface_dib.c

[Maxime Bellengé]

This patch causes a regression in Icewind Dale II. Some sprites get
their background corrupted.

Log message:
	Christian Costa <titan.costa at wanadoo.fr>
	Take RGB mask into account when doing color keying.
	Add corresponding conformance test.

Patch: http://cvs.winehq.org/patch.py?id=19609

This patch fixes it.

Maxime

Changelog:
    * Fix regression in color keying with RGB mask.
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