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/osip/default.nix

@@ -9,7 +9,7 @@ stdenv.mkDerivation rec {
 
   meta = {
     license = stdenv.lib.licenses.lgpl21Plus;
-    homepage = http://www.gnu.org/software/osip/;
+    homepage = https://www.gnu.org/software/osip/;
     description = "The GNU oSIP library, an implementation of the Session Initiation Protocol (SIP)";
     maintainers = with stdenv.lib.maintainers; [ raskin ];
     platforms = stdenv.lib.platforms.linux;