Adding WWW::CheckSite

WWW::CheckSite it's not anymore on cpan, but it's on backpan
Generally, the HOMEPAGE variable doesn't need to be set, `perl-module` eclass handles that by default by combining it with `MODULE_AUTHOR`.

However, in this case, the given `HOMEPAGE` URI is a deadlink, so perhaps `http://backpan.perl.org/authors/id/A/AB/ABELTJE/` is as close as we can presently get to a "useful" homepage, at least that gives away a "this is dead" vibe.