bin/menuconfig: Normalize after updating the kernel config

This is needed because the build environment differs in the kernel
normalization step compared to the build step.

bin/menuconfig

@@ -69,6 +69,9 @@ Dir.chdir(ROOT) do
   else
     system(tool, FILE)
   end
+
+  # Force normalize at the end. Otherwise recent kernels (5.8+) will have the wrong compiler data.
+  exec(File.join(ROOT, "bin", "kernel-normalize-config"), *ARGV)
 end
 
 # vim: ft=ruby