gdi32: Handle BITMAP_CopyBitmap correctly for negative heights

[Maarten Lankhorst]

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BITMAP_GetObject has a line with 'dib->dsBmih.biHeight = abs( 
dib->dsBmih.biHeight );', this would make negative height bitmaps 
impossible to duplicate correctly unless I write to an intermediary 
buffer, instead of doing that, I call GDI_GetObjPtr directly saving the 
unneeded malloc & memcpy.
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