Initial support for 5.13 rc1

I have ported Project C v5.12-r1 over. We're missing fsync/futex2.

linux-tkg-config/5.13/cleanup

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+for _f in /usr/lib/modules/*tkg*; do
+  if [[ ! -e ${_f}/vmlinuz ]]; then
+    rm -rf "$_f"
+  fi
+done
+
+# vim:set ft=sh sw=2 et:
+