This is needed to encode the correct ABI into the generated qml caches.
It is identical with the return value of QSysInfo::buildAbi().

Change-Id: I2d581b22326da4220f412ab4f517156f4ba31897
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>