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/commoncpp2/default.nix

@@ -30,7 +30,7 @@ stdenv.mkDerivation rec {
          to build native threading applications for Microsoft Windows.
       '';
 
-    homepage = http://www.gnu.org/software/commoncpp/;
+    homepage = https://www.gnu.org/software/commoncpp/;
     license = stdenv.lib.licenses.gpl2Plus;
     maintainers = [ stdenv.lib.maintainers.marcweber ];
     platforms = with stdenv.lib.platforms; linux;