Backport of r3183

--- gnucobol-3.0-rc1/tests/Makefile.am	2018-04-22 19:55:51.000000000 +0000
+++ gnucobol-3.0-rc1/tests/Makefile.am	2019-06-28 16:49:23.740928336 +0000
@@ -74,7 +74,7 @@
 check-local: $(TESTSUITE)
 	@echo testing for working diff && diff - "$(TESTSUITE)" < "$(TESTSUITE)" \
 		|| (echo "Error: no working 'diff' in PATH" && false)
-	@$(TESTSUITE) $(TESTSUITEFLAGS) || rm -f testsuite.dir/at-job-fifo
+	@$(TESTSUITE) $(TESTSUITEFLAGS) || (rm -f testsuite.dir/at-job-fifo; exit 1)
 	@rm -f testsuite.dir/at-job-fifo
 
 clean-local:
@@ -84,7 +84,7 @@
 	@cp $(srcdir)/run_prog_manual.sh.in $@
 
 checkmanual: $(TESTSUITE_MANUAL) ./run_prog_manual.sh
-	@$(TESTSUITE_MANUAL) $(TESTSUITEFLAGS) || rm -f testsuite_manual.dir/at-job-fifo
+	@$(TESTSUITE_MANUAL) $(TESTSUITEFLAGS) || (rm -f testsuite_manual.dir/at-job-fifo; exit 1)
 	@rm -f testsuite_manual.dir/at-job-fifo
 
 # targets that are only logical targets instead of files