[winex11.drv] correctly handle overlapping src/dst regions

[Damjan Jovanovic]

If the destination rectangle is below the source rectangle in the same
DIB, the copying should be done bottom-to-top to correctly handle
vertical overlap. Also memmove should be used instead of memcpy to
correctly handle horizontally overlapping regions. This fixes a bitmap
corruption bug in Reason 3 and probably a similar bug in iTunes
(#9145).

Changelog:
* Correctly handle overlapping source and destination regions on the
same DIB when copying DIBs client-side.

Damjan Jovanovic
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