linux59-tkg: Update linux59-rc-tkg to 5.9.0 release

This is an initial release with a couple compilation fixes for Project C schedulers (until Alfred fixes it on his end). Fsync support is missing at this point in time.

linux59-tkg/linux59-tkg-config/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:
+