updated for version 7.4.503
Problem:    Cannot append a list of lines to a file.
Solution:   Add the append option to writefile(). (Yasuhiro Matsumoto)
diff --git a/src/Makefile b/src/Makefile
index cfdca44..39e2de9 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -1899,8 +1899,12 @@
 	test_insertcount \
 	test_listlbr \
 	test_listlbr_utf8 \
+	test_mapping \
 	test_options \
 	test_qf_title \
+	test_signs \
+	test_utf8 \
+	test_writefile \
 	test10 test11 test12 test13 test14 test15 test16 test17 test18 test19 \
 	test20 test21 test22 test23 test24 test25 test26 test27 test28 test29 \
 	test30 test31 test32 test33 test34 test35 test36 test37 test38 test39 \