Fix up f5b851f8

 introducing
multiple values for the -qmldir option.

Change-Id: Ib199105776d42b6eaa81003ed5682b2272a19a53
Reviewed-by: Oliver Wolff <oliver.wolff@digia.com>

Change-Id: If8d3964f82ff1ca92aa9d1df05bd4573261401fb
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>

Otherwise, passing relative paths to the -qmldir option does not work.

Change-Id: I4cff5a0e1ef7a2bcfa82558bb1898361f77f3014
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>

Run qmlimportscanner to find the QML modules and scan their
plugins for additional dependencies.

Change-Id: Ia35e71441c4b97be0561b42fee21e8e6e961d1e5
Reviewed-by: Andrew Knight <andrew.knight@digia.com>
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>