QHeaderView::paintSection(): fix visible index handling

Sections may be hidden => QStyleOptionHeader::position must reflect the
state seen on the screen. Otherwise styles will give wrong visual
results.

Task-number: QTBUG-32203
Change-Id: I7ef86496be092bf6f52ec45f757b501f38c3a431
Reviewed-by: Thorbjørn Lund Martsum <tmartsum@gmail.com>
Reviewed-by: Stephen Kelly <stephen.kelly@kdab.com>
Remove not supported mkspecs for Windows CE.

Windows CE 5 and the depending Windows Mobile
is not supported.

Change-Id: I81b9599f837590a1375b6340e58c47b478c079ba
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>