+ fix "Unknown module(s) in QT: location-private positioning-private"

Following a QMake project fix I did on a different PR.

Fix the formatting at "Initialize submodules".

Only seems to be missing in some cases but can’t hurt if already
installed.

Also added Qt version check.
And made the platform/toolchain check a little more descriptive.

Now all prerequisite packages should be listed for Arch, Fedora, and Ubuntu.