RFE: Better support for unbundling

[rapgro]

Please provide a .prf file to use with QMake. Try to use qmake-{qt4|qt5} CONFIG+=iris

qtsingleapplication / qtlockedfile (QtSolutions) could be used for .prf template.
http://pkgs.fedoraproject.org/cgit/qtlockedfile.git/tree/qtlockedfile.prf

Downstream: https://bugzilla.redhat.com/show_bug.cgi?id=1264097

[rapgro]

psi-plus/main#560