In case the qmake-line does not contain a mkspec argument,
use the mkspec of the Qt version found by matching the
qmake binary.
This reduces the duplication of targets/profiles when opening
new projects.
Change-Id: I647e166ae0322fd093967abea760197cf4c7eedd
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@nokia.com>