fix cleanup of install dir (and module) if `--force` without `--skip` is used

[boegel]

trafficstars

Cleaning up the install directory should be tackled a lot earlier, i.e. before the configure step is started.

When debugging an issue with building Perl, I noticed the Perl configure script was picking up binaries in from the previous installation...

Besides that, the module file should be removed as well when a --force build (without the use of --skip) is being performed. It makes no sense to leave the module around if the install directory is wiped.