Remove unused variable in qwindowsmousehandler.cpp.

Change-Id: Iacfeec396c2eeef973b62bf78c698aa206b01c41
Reviewed-by: Andy Shaw <andy.shaw@digia.com>
Windows: Fix qt_imageFromWinHBITMAP().

Factor out common code paths from the QPixmap/QImage conversion
code and use the same algorithm for copying the image data with
alpha correction as does qt_pixmapFromWinHBITMAP().

Rename the previous version of qt_imageFromWinHBITMAP() to
qt_imageFromWinIconHBITMAP() since it is used for HICON conversion.

Task-number: QTBUG-39084
Change-Id: Ia4042c33db485c3604461a5eafd6282968b36e3b
Reviewed-by: Andy Shaw <andy.shaw@digia.com>
QPrinter/Windows: Fix handling of native paper source ids.

On Windows, it is possible to pass native Windows paper source
ids >= DMBIN_USER to QPrinter::setPaperSource() and they are
listed by supportedPaperSources().

Task-number: QTBUG-38897
Task-number: QTBUG-38888
Change-Id: I8f1264e80ce5bdddd3873602200b24eabee00502
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Reviewed-by: Andy Shaw <andy.shaw@digia.com>