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/autogen/default.nix

@@ -51,7 +51,7 @@ stdenv.mkDerivation rec {
   meta = with stdenv.lib; {
     description = "Automated text and program generation tool";
     license = with licenses; [ gpl3Plus lgpl3Plus ];
-    homepage = http://www.gnu.org/software/autogen/;
+    homepage = https://www.gnu.org/software/autogen/;
     platforms = platforms.all;
     maintainers = [ ];
   };