Makefile.am: followup to #21995, recheck target should call recheck in sub-directories

Makefile.am

@@ -189,7 +189,7 @@ include starpu-top/extradist
 recheck:
 	RET=0 ; \
 	for i in $(SUBDIRS) ; do \
-		make -C $$i showcheck || RET=1 ; \
+		make -C $$i recheck || RET=1 ; \
 	done ; \
 	exit $$RET