h8eurobot: Enable PXMC in config

I hope that this suppress the build error reported by buildbot.

diff --git a/src/sysless b/src/sysless
index 439d119cc0064a3c1f18abd56c64b61b32a8f21c..d77f7efa386c01359ae120a9532f2b96a62eb141 160000 (submodule)
--- a/src/sysless
+++ b/src/sysless
@@ -1 +1 @@
-Subproject commit 439d119cc0064a3c1f18abd56c64b61b32a8f21c
+Subproject commit d77f7efa386c01359ae120a9532f2b96a62eb141