Treewide: use HTTPS on GNU Savannah domains

HTTP -> HTTPS for:
- http://savannah.gnu.org/
- http://git.savannah.gnu.org/
- http://download.savannah.gnu.org/
- http://svn.savannah.gnu.org/

pkgs/development/interpreters/guile/1.8.nix

@@ -58,7 +58,7 @@ stdenv.mkDerivation rec {
   # One test fails.
   # ERROR: file: "libtest-asmobs", message: "file not found"
   # This is fixed here:
-  # <http://git.savannah.gnu.org/cgit/guile.git/commit/?h=branch_release-1-8&id=a0aa1e5b69d6ef0311aeea8e4b9a94eae18a1aaf>.
+  # <https://git.savannah.gnu.org/cgit/guile.git/commit/?h=branch_release-1-8&id=a0aa1e5b69d6ef0311aeea8e4b9a94eae18a1aaf>.
   doCheck = false;
   doInstallCheck = doCheck;
 

pkgs/development/interpreters/guile/2.0.nix

@@ -41,7 +41,7 @@
   patches = [ ./disable-gc-sensitive-tests.patch ./eai_system.patch ./clang.patch
     (fetchpatch {
       # Fixes stability issues with 00-repl-server.test
-      url = "http://git.savannah.gnu.org/cgit/guile.git/patch/?id=2fbde7f02adb8c6585e9baf6e293ee49cd23d4c4";
+      url = "https://git.savannah.gnu.org/cgit/guile.git/patch/?id=2fbde7f02adb8c6585e9baf6e293ee49cd23d4c4";
       sha256 = "0p6c1lmw1iniq03z7x5m65kg3lq543kgvdb4nrxsaxjqf3zhl77v";
     })
     ./riscv.patch