`use base` claims to be able to find the named parent module even
when it's defined otherwise than a separate file with a matching
name. When committing to the NetBSD wiki, I'm seeing RPC::XML errors
that suggest otherwise ("Can't locate RPC/XML/datatype.pm" and so on).

I don't know why we're having this problem on wiki.n.o and I haven't
managed to reproduce it elsewhere, but it sure looks fixed after
switching to `use parent -norequire`. `use parent` seems to be
generally preferred usage anyway.

Bump PKGREVISION.

(schmonz)