DDraw: Implement depth filling through blit. (re-resubmit) try3

[greg87 at online.de]

Original Author:
Elie Morisse
lachienne at wanadoo.fr

Updated by:
Gregor Münch
greg87 at online.de

This is modified version of this patch:
http://www.winehq.org/pipermail/wine-patches/2006-September/030815.html

With the help from Stefan Dösinger I altered 2 lines. Full credit
belongs to Elie Morisse

fixes: http://bugs.winehq.org/show_bug.cgi?id=4306
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