Change http://perl.apache.org/dist/ to http://apache.org/dist/perl/ in a couple of places.

*** The top-level RELEASE file needs a major overhaul in this regard too, but I will leave that until the next release is made so that the changes can be tried out at the same time. ***

git-svn-id: https://svn.apache.org/repos/asf/perl/modperl/trunk@1560449 13f79535-47bb-0310-9956-ffa450edef68