GDI patch for Acad. Please feedback !

[P. Christeas]

Below there is a patch which makes AutoCAD R14 work under wine.
The patch involves (patch1.diff) some calculation for Bitmaps drawn in 
negative-y-axis (i.e. bottom-left is 0,0) windows. I just found that solution 
by trying. Therefore, the patch, may cause trouble to other apps (mostly 
drawing - CAD ones).

*Please* try this patch and report if any app (just any!) mis-behaves with 
it. If you have any other solution for the same point, please tell me.

The file 'patch2.diff' has one more suggestion, concerning NULL object 
handles. This should only introduce a minor speedup and suppress a warning 
message, which made gdi debugging little hard.