patch 9.0.0560: elapsed time since testing started is not visible

Problem:    Elapsed time since testing started is not visible.
Solution:   Show the elapsed time while running tests.
diff --git a/src/testdir/Make_all.mak b/src/testdir/Make_all.mak
index d7abcb5..18409d2 100644
--- a/src/testdir/Make_all.mak
+++ b/src/testdir/Make_all.mak
@@ -7,6 +7,9 @@
 NO_PLUGINS = --noplugin --not-a-term
 NO_INITS = -U NONE $(NO_PLUGINS)
 
+# File to delete when testing starts
+CLEANUP_FILES = test.log messages starttime
+
 # Tests for tiny and small builds.
 SCRIPTS_TINY = \
 	test20 \