patch 8.1.1478: still an error when running tests with the tiny version

Problem:    Still an error when running tests with the tiny version.
Solution:   Do not try reading test.log
diff --git a/src/testdir/Makefile b/src/testdir/Makefile
index 0abf661..4bfc400 100644
--- a/src/testdir/Makefile
+++ b/src/testdir/Makefile
@@ -49,6 +49,11 @@
 benchmark: $(SCRIPTS_BENCH)
 
 report:
+	# without the +eval feature test_result.log is a copy of test.log
+	@/bin/sh -c "if test -f test.log; \
+		then cp test.log test_result.log; \
+		else echo No failures reported > test_result.log; \
+		fi"
 	$(RUN_VIMTEST) $(NO_INITS) -S summarize.vim messages $(REDIR_TEST_TO_NULL)
 	@echo
 	@echo 'Test results:'