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/libraries/ncurses/default.nix

@@ -159,7 +159,7 @@ stdenv.mkDerivation rec {
       ported to OS/2 Warp!
     '';
 
-    homepage = http://www.gnu.org/software/ncurses/;
+    homepage = https://www.gnu.org/software/ncurses/;
 
     license = lib.licenses.mit;
     platforms = lib.platforms.all;