patch 7.4.1954
Problem:    No test for what 7.4.1948 fixes.
Solution:   Add a test. (Hirohito Higashi, closes #880)
diff --git a/src/Makefile b/src/Makefile
index 76b16b6..5c4e44f 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -2031,6 +2031,7 @@
 	test_help_tagjump \
 	test_history \
 	test_increment \
+	test_increment_dbcs \
 	test_join \
 	test_json \
 	test_langmap \