Android: Enable 64-bit configuration on Windows host platform

Default to android-21 when a 64-bit target is chosen, as this is
the lowest API level supported for 64-bit targets.

Change-Id: If4ece23911c3e9e45558906d970ef85a3b18b0bb
Reviewed-by: BogDan Vatra <bogdan@kde.org>
Ensure that a leave event is sent to a popup that is being closed

If a context menu contains a menu item which will open a dialog, the
context menu will never get the leave event, which might leave the menu
in an invalid state.

Synthetic leave events are sent to windows, but not to popups that are
blocked by modal dialogs. Hovever, a popup is removed from the popup
stack in QApplication before it receives the leave event. Therefore
always give popups events, even when they are not visible.

Task-number: QTBUG-38021
Change-Id: I63f6febed44f1e7c8f29e7a09af07f32b4ddbc82
Reviewed-by: Shawn Rutledge <shawn.rutledge@digia.com>
BlackBerry 10 specific widget style as a style plugin

- upstreaming the implementation of a BlackBerry 10 specific widget style
- modfied to be integrated as a style plugin being a part of the QtBase
- according docs are provided in QtDocs in another commit
- attributing the excellent work at KDAB who was the original developer

Change-Id: I57c548f6ec4cf02f125ee216f1ce1b764f29e8bb
Reviewed-by: Bernd Weimer <bweimer@blackberry.com>
Reviewed-by: Rafael Roquetto <rafael.roquetto@kdab.com>