patch 7.4.2223
Problem:    Buffer overflow when using latin1 character with feedkeys().
Solution:   Check for an illegal character.  Add a test.
diff --git a/src/Makefile b/src/Makefile
index 84ebdc6..28b4b20 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -2114,6 +2114,7 @@
 	test_set \
 	test_signs \
 	test_sort \
+	test_source_utf8 \
 	test_startup \
 	test_startup_utf8 \
 	test_stat \