Revert change accidentally included in runtime file updates. Closes #3998.
diff --git a/src/testdir/Makefile b/src/testdir/Makefile
index 8e979a8..c3ba8ab 100644
--- a/src/testdir/Makefile
+++ b/src/testdir/Makefile
@@ -12,13 +12,13 @@
# Comment out this line to see the verbose output of tests.
#
# Catches SwapExists to avoid hanging at the ATTENTION prompt.
-#REDIR_TEST_TO_NULL = --cmd 'au SwapExists * let v:swapchoice = "e"' > /dev/null
+REDIR_TEST_TO_NULL = --cmd 'au SwapExists * let v:swapchoice = "e"' > /dev/null
# Uncomment this line to use valgrind for memory leaks and extra warnings.
# The output goes into a file "valgrind.testN"
# Vim should be compiled with EXITFREE to avoid false warnings.
# This will make testing about 10 times as slow.
-#VALGRIND = valgrind --tool=memcheck --leak-check=yes --num-callers=25 --log-file=valgrind.$*
+# VALGRIND = valgrind --tool=memcheck --leak-check=yes --num-callers=25 --log-file=valgrind.$*
default: nongui