ci fix for sasa 4.0.3

expe/Makefile.inc

-# Time-stamp: <modified the 03/09/2020 (at 09:42) by Erwan Jahier>
+# Time-stamp: <modified the 18/04/2021 (at 11:49) by Erwan Jahier>
 #
 # This Makefile is meant to be includes by directories below
 
@@ -7,6 +7,7 @@
 	sasa -reg $<
 
 %.cmxs: %.ml
+	touch config.ml # so that it compiles under sasa 4.0.3
 	ocamlfind ocamlopt -package algo -shared state.ml $(shell sasa -algo $*.dot) config.ml $< -o $@