Bring qmetaobjectbuilder in sync with moc

Bring qmetaobjectbuilder in sync with moc

qmetaobjectbuilder should generate meta-objects of the same version
as moc; in the future, when the moc version is bumped, QMOB has to
be adapted at the same time.

QMOB was generating version 4 meta-objects. This patch makes it
generate version 6 (the current version). This also fixes a bug with
using qt_static_metacall with QMOB (setStaticMetacallFunction()); it
was already using the version 6 qt_static_metacall signature, which
isn't compatible with version 4.

Also add tests that ensure that the QMOB-generated meta-object works
with real objects; in particular we want to test the codepaths in Qt
that check for version >= 4.

Change-Id: I64a151ea5c947a6f8b7a00e85a39866446c735e9
Reviewed-by: Bradley T. Hughes <bradley.hughes@nokia.com>