Perl's scripts are still trying to execute perl out of /usr/gnu/bin/perl.
The hack Larry was using for h2ph.1 doesn't work with the new macros, so
make it a real man page.
Also, we weren't building the .ph files, add them as an afterinstall rule
in the x2p subdirectory.
and /usr/share/perl (library). The latter was chosen as analogous to other
directories already present in /usr/share, like /usr/share/groff_font and
(particularly) /usr/share/mk.