XCB: Suppress warnings about unhandled client messages.

Introduced by the tray icon refactoring
d8090022f66cc6cff6af5ed2ae702212fd172ff7 among other things.

Task-number: QTBUG-33068
Change-Id: I7c536c68acc2fae39ca30afb401500d0dc8701b1
Reviewed-by: Uli Schlachter <psychon@znc.in>
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@digia.com>
Reviewed-by: Shawn Rutledge <shawn.rutledge@digia.com>
Android: Add default values for min and target SDKs

The minimum SDK version supported should be set to 9, since this
is required by Qt. We also set the target SDK version to 14, since
this will remove certain compatibility features, like the overflow
button in the action bar.

Task-number: QTBUG-30860
Change-Id: Iddd0eba2e802d03c5fe6e9b5da626808bbbad71d
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@digia.com>
Reviewed-by: BogDan Vatra <bogdan@kde.org>