PackageRepositoryList - kill dead code

[Jean-Philippe Ouellet]

This is no longer used anywhere, and even crashes if you try to call it.
Besides, OpenBSD::PackageRepository::Source was removed almost a year ago.

Index: PackageRepositoryList.pm
===================================================================
RCS file: /cvs/src/usr.sbin/pkg_add/OpenBSD/PackageRepositoryList.pm,v
retrieving revision 1.29
diff -u -p -d -r1.29 PackageRepositoryList.pm
--- PackageRepositoryList.pm    3 Feb 2015 10:26:29 -0000       1.29
+++ PackageRepositoryList.pm    23 Jun 2015 21:51:18 -0000
@@ -89,15 +89,4 @@ sub match_locations
        return [];
 }
 
-sub print_without_src
-{
-       my $self = shift;
-       my @l = ();
-       for my $repo (@$self) {
-               next if $repo->isa("OpenBSD::PackageRepository::Source");
-               push(@l, $repo->url);
-       }
-       return join(':', @l);
-}
-
 1;