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/global/default.nix

@@ -51,7 +51,7 @@ stdenv.mkDerivation rec {
       independence of any editor.  It runs on a UNIX (POSIX) compatible
       operating system like GNU and BSD.
     '';
-    homepage = http://www.gnu.org/software/global/;
+    homepage = https://www.gnu.org/software/global/;
     license = licenses.gpl3Plus;
     maintainers = with maintainers; [ pSub peterhoeg ];
     platforms = platforms.unix;