linuxPackages.jool: 3.5.7 -> unstable-20180706 (#47284)

3.5.7 doesn't build with kernel 4.14.71.
Needs most recent upstream revision to build, which supports
kernels up to 4.17.

pkgs/os-specific/linux/jool/default.nix

@@ -1,6 +1,6 @@
 { stdenv, fetchFromGitHub, kernel }:
 
-assert stdenv.lib.versionOlder kernel.version "4.17";
+assert stdenv.lib.versionOlder kernel.version "4.18";
 
 let
   sourceAttrs = (import ./source.nix) { inherit fetchFromGitHub; };