Patch to properly bitBlt() masked pixmaps

[Ryan Rusaw]

Below is a patch that reverts an incorrect fix I submitted through the 
bug tracker last month in regards to improper masked bitBlt()'s and then 
fixes it in the correct manner. My first patch, in error, ignored the 
Qt::RasterOp passed to bitBlt().

Explanation:
The original call to CreateCompatibleBitmap() was on the newly created 
in-memory temporary DC (hTmpDC) and as such always returns the 1x1 
monochrome bitmap that is by default selected into it. 
CreateCompatibleBitmap() should be called on the original device 
(dsthandle) instead.

Sorry about the previous error.

Ryan

921c921,927
<         BitBlt( dsthandle, dx, dy, sw, sh, srchandle, sx, sy, SRCINVERT );
---
 >         HDC hTmpDC = CreateCompatibleDC( dsthandle );
 >         HBITMAP hTmpBmp = CreateCompatibleBitmap( dsthandle, sw, sh );
 >
 >         HBITMAP hOldBmp1 = ( HBITMAP ) SelectObject( hTmpDC, hTmpBmp );
 >         BitBlt( hTmpDC, 0, 0, sw, sh, srchandle, sx, sy, ropCodes[ 
rop ] );
 >
 >         BitBlt( dsthandle, dx, dy, sw, sh, hTmpDC, 0, 0, SRCINVERT );
923c929,933
<         BitBlt( dsthandle, dx, dy, sw, sh, srchandle, sx, sy, SRCINVERT );
---
 >         BitBlt( dsthandle, dx, dy, sw, sh, hTmpDC, 0, 0, SRCINVERT );
 >
 >         SelectObject( hTmpDC, hOldBmp1 );
 >         DeleteObject( hTmpBmp );
 >         DeleteDC( hTmpDC );