Noarch lib-dir was only used in one wrong place

dune.module does not contain any paths to architecture-specific
binaries. It is therefore always installed in no-arch lib/ directory.
Thus, there is no need to have a variable for this, and there was
no other users of this variable either.
Always search for dune.module in no-arch lib-dir

The previous version may have ended up in lib64/ instead of lib/;
now we remove the arch-specific suffix from the path, and always
use the no-arch version.
Print version number in log together with location
Merge pull request #350 from rolk/350_dunemod

Dune.module is searched for in the wrong directory