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/interpreters/guile/1.8.nix

@@ -66,7 +66,7 @@ stdenv.mkDerivation rec {
 
   meta = {
     description = "Embeddable Scheme implementation";
-    homepage    = http://www.gnu.org/software/guile/;
+    homepage    = https://www.gnu.org/software/guile/;
     license     = stdenv.lib.licenses.lgpl2Plus;
     maintainers = [ stdenv.lib.maintainers.ludo ];
     platforms   = stdenv.lib.platforms.unix;