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/tools/compression/lbzip2/default.nix

@@ -9,7 +9,7 @@ stdenv.mkDerivation rec {
   };
 
   meta = with stdenv.lib; {
-    homepage = http://lbzip2.org/;
+    homepage = "https://github.com/kjn/lbzip2"; # Formerly http://lbzip2.org/
     description = "Parallel bzip2 compression utility";
     license = licenses.gpl3;
     maintainers = with maintainers; [ abbradar ];