treewide: quote URLs in my packages

pkgs/development/libraries/libisofs/default.nix

@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
   propagatedBuildInputs = [ acl ];
 
   meta = with stdenv.lib; {
-    homepage = http://libburnia-project.org/;
+    homepage = "http://libburnia-project.org/";
     description = "A library to create an ISO-9660 filesystem with extensions like RockRidge or Joliet";
     license = licenses.gpl2Plus;
     maintainers = with maintainers; [ abbradar vrthra ];