QTimeZone: declare as shared

This enables specialisations of (std and q) swap using member-swap
and declares the types movable for efficient use in Qt containers,
and QList in particular.

This is a binary-incompatible change, so cannot wait for 5.2.1.

Change-Id: I431315e148b95f82dc3d4471c57ef729539dca9f
Reviewed-by: John Layt <jlayt@kde.org>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>

src/corelib/tools/qtimezone.h

@@ -152,6 +152,7 @@ private:
 };
 
 Q_DECLARE_TYPEINFO(QTimeZone::OffsetData, Q_MOVABLE_TYPE);
+Q_DECLARE_SHARED(QTimeZone)
 
 #ifndef QT_NO_DATASTREAM
 Q_CORE_EXPORT QDataStream &operator<<(QDataStream &ds, const QTimeZone &tz);