Treewide: update some problematic homepages

These URLs are reported as problematic by Repology.
It could be a permanent redirection
or the page does not exist anymore

pkgs/development/perl-modules/MNI/default.nix

@@ -16,6 +16,7 @@ buildPerlPackage {
   doCheck = false;  # TODO: almost all tests fail ... is this a real problem?
 
   meta = with stdenv.lib; {
+    homepage = "https://github.com/BIC-MNI/mni-perllib";
     license = with licenses; [ artistic1 gpl1Plus ];
     maintainers = with maintainers; [ bcdarwin ];
   };

pkgs/development/perl-modules/Mozilla-LDAP/default.nix

@@ -12,6 +12,7 @@ buildPerlPackage rec {
   };
   meta = {
     description = "Mozilla's ldap client library";
+    homepage = "https://metacpan.org/release/perldap";
     license = with lib.licenses; [ mpl20 lgpl21Plus gpl2Plus ];
   };
 }

pkgs/development/perl-modules/strip-nondeterminism/default.nix

@@ -27,6 +27,7 @@ buildPerlPackage rec {
 
   meta = with lib; {
     description = "A Perl module for stripping bits of non-deterministic information";
+    homepage = "https://reproducible-builds.org/";
     license = licenses.gpl3;
     maintainers = with maintainers; [ pSub ];
   };