Make dependencies on modules included in the perl 5.8
distribution conditional on the perl version installed.
While I'm here, remove SITE_PERL and MAN(3)PREFIX.
17 + 29 + 234 = 280 PRs. It's about time he starts doing the work himself!
PR: ports/50588
Submitted by: Erwin Lansing <erwin@lansing.dk>
bento should not build these ports either, so mark IGNORE
instead of BROKEN when perl < 5.6
PR: ports/48207
Submitted by: Erwin Lansing <erwin@lansing.dk>