grub: update savannah git to working url (#467001)

pkgs/tools/misc/grub/default.nix

@@ -74,7 +74,7 @@ let
   inPCSystems = lib.any (system: stdenv.hostPlatform.system == system) (lib.attrNames pcSystems);
 
   gnulib = fetchgit {
-    url = "https://https.git.savannah.gnu.org/git/gnulib.git";
+    url = "https://git.savannah.gnu.org/git/gnulib.git";
     # NOTE: keep in sync with bootstrap.conf!
     rev = "9f48fb992a3d7e96610c4ce8be969cff2d61a01b";
     hash = "sha256-mzbF66SNqcSlI+xmjpKpNMwzi13yEWoc1Fl7p4snTto=";
@@ -98,7 +98,7 @@ stdenv.mkDerivation rec {
   version = "2.12";
 
   src = fetchgit {
-    url = "https://https.git.savannah.gnu.org/git/grub.git";
+    url = "https://git.savannah.gnu.org/git/grub.git";
     tag = "grub-${version}";
     hash = "sha256-lathsBb2f7urh8R86ihpTdwo3h1hAHnRiHd5gCLVpBc=";
   };