This should complete PR 75

Make pod2mantest useable on DOS-based systems.
Part of PR 75, the rest is still under investigation.

Make sure to use the predefined PERL.
Submitted by: Bernhard Simon <bs@bsws.zid.tuwien.ac.at>
Reviewed by:
PR:

Deal with that by testing any available pod2man and using it if appropriate,
and falling back to util/pod2man.pl if none was found.