FHS and FSSTND build and copyright cleanup

FHS and FSSTND build and copyright cleanup

Remove the remaining (mostly commented-out) build rules for FHS 2.1 and
FSSTND.  Remove the groff patch needed for building some versions of
FHS 2.1 ourselves.

Remove the (non-free) FSSTND license from debian/copyright since no
FSSTND files are still part of Policy.  FHS replaced it.

Update the copyright years for FHS in debian/copyright.

git-archimport-id: rra@debian.org--lenny/debian-policy--devel--3.7--patch-29