The old name Asia/Calcutta is being phased out. We can't assign
QTzTZP, so select between new name and old using a reference variable.
In the process, fix a QCOMPARE() against bool to a QVERIFY().
Pick-to: 6.6 6.5
Change-Id: I7cd8a813f8a88c8ae4ba07213f04f4ad0860cec0
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>