gitignore: Add another test-suite file

Signed-off-by: Bryce Harrington <b.harrington@samsung.com>
diff --git a/.gitignore b/.gitignore
index c146bac..d9d26ed 100644
--- a/.gitignore
+++ b/.gitignore
@@ -47,6 +47,7 @@
 fixed-test
 list-test
 map-test
+message-test
 os-wrappers-test
 queue-test
 resources-test