Treewide: use HTTPS on GNU domains

HTTP -> HTTPS for :
- http://gnu.org/
- http://www.gnu.org/
- http://elpa.gnu.org/
- http://lists.gnu.org/
- http://gcc.gnu.org/
- http://ftp.gnu.org/ (except in fetchurl mirrors)
- http://bugs.gnu.org/

pkgs/development/tools/misc/ddd/default.nix

@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
   patches = [ ./gcc44.patch ];
 
   meta = {
-    homepage = http://www.gnu.org/software/ddd;
+    homepage = https://www.gnu.org/software/ddd;
     description = "Graphical front-end for command-line debuggers";
     license = stdenv.lib.licenses.gpl2;
     platforms = stdenv.lib.platforms.linux;