Qt: use QPolygonH to draw poly regions in FillRgn()


git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40954 4005530d-fff6-0310-9dd1-cebe43e6787f
wsarrow: fixed wrong reference to pen instead to brush. Now it paints arrows under qt,gtk2 and win32 (guess others are ok too)


git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@40955 4005530d-fff6-0310-9dd1-cebe43e6787f