we install them into a private directory under the the normal Perl
installation and configure Perl so that site-specific Perl man3 pages
are installed into a private directory within site_perl. This avoids
manpage conflicts between 3rd-party modules, the standard Perl library,
and other packages.
The changes implement some unfinished work that is alluded to in the
MakeMaker.pm module by allowing "installsiteman{1,3}dir" to be set
during the configuration process and are used to provide default values
for INSTALLSITEMAN{1,3}DIR during the Perl module build/install process.
Bump PKGREVISIONs for lang/perl5 and lang/perl58.