qmljs: avoid reset if C++ types did not really change

Change-Id: I00b59a6b140eb33e2f3206f11e6ab0f9b470dff0
Reviewed-by: Marco Bubke <marco.bubke@digia.com>
qmljs: remove absolute path library imports

Change-Id: Ib1d6708b7f280d5906452ae5fefc11f8a8700db9
Reviewed-by: Marco Bubke <marco.bubke@digia.com>