Disable error message box on WinRT

While exception handling methods are not available on WinRT, the debug
mode ones are. This way we can suppress error dialogs from popping up
like on desktop windows.

Change-Id: Id6e9666af9274d373e7d46e3f9e44892a2bd0dbc
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
QSocks5SocketEngine: use QSignalBlocker

Change-Id: Ib30daf8d716401cf3e2c562dc3ab7924b026189d
Reviewed-by: Richard J. Moore <rich@kde.org>
Make use of the internal space for enum in QVariant

Enums are movable even if they have not been tagged as such, and
therefore can safely make use of the internal storage.

Change-Id: I3bec8556bfeb4a07cb30d918f8d1dd2565d6d94a
Reviewed-by: Jędrzej Nowacki <jedrzej.nowacki@digia.com>