Fix new warnings under Clang 3.3

Probably added by a1898f4466518bf3e1b6e9154eec05ecf9d909e3.

qmetatype.h:70:29: error: inline function 'qMetaTypeId<QtMetaTypePrivate::QSequentialIterableImpl>' is not defined [-Werror,-Wundefined-inline]
qmetatype.h:1363:30: note: used here
            const int toId = qMetaTypeId<QtMetaTypePrivate::QSequentialIterableImpl>();

qmetatype.h:70:29: error: inline function 'qMetaTypeId<QtMetaTypePrivate::QAssociativeIterableImpl>' is not defined [-Werror,-Wundefined-inline]
qmetatype.h:1386:30: note: used here
            const int toId = qMetaTypeId<QtMetaTypePrivate::QAssociativeIterableImpl>();

Change-Id: I9afe1a3d50ab23eb701797e28b259966dc95a147
Reviewed-by: Stephen Kelly <stephen.kelly@kdab.com>