[try 2]winex11.drv/dib.c - fix SetDIBits() for startscan != 0

[Massimo Del Fedele]

Changes from previous one :
bits shifting displaced from X11DRV_SetDIBits() to X11DRV_DIB_SetImageBits()
Result is identical to former, the patch looks worse to me than before, but....
As a note, there's no way to leave 'descr->bits' untouched without adding at least another
parameter (ySrc) to the bunch of X11DRV_DIB_SetImageBits_xxx() functions.

Ciao

Max
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