Qnx: Package user assets as well when bundling Qt libs

Task-number: QTCREATORBUG-11652

Change-Id: Ib5c26b0b25542eb8e92f5ff65a4f3ec31b82bfff
Reviewed-by: Tobias Nätterlund <tobias.naetterlund@kdab.com>
Reviewed-by: David Kaspar <dkaspar@blackberry.com>
Reviewed-by: Nicolas Arnaud-Cormos <nicolas@kdab.com>