Update gitignore for new test binary.  (Oyvind Holm, closes #954)
diff --git a/.gitignore b/.gitignore
index 97e6d2d..8bff474 100644
--- a/.gitignore
+++ b/.gitignore
@@ -79,3 +79,4 @@
 src/testdir/viminfo
 src/memfile_test
 src/json_test
+src/message_test