[mutter] Update .gitignore

[Jasper St. Pierre <jstpierre src gnome org>]

commit f95f3b1ca5fd7d81acc1567aa3665cfeede89a97
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Mon Mar 21 14:58:09 2016 -0700

    Update .gitignore

 .gitignore |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/.gitignore b/.gitignore
index 10486c1..ab5e2ac 100644
--- a/.gitignore
+++ b/.gitignore
@@ -46,6 +46,7 @@ mutter
 mutter-restart-helper
 mutter-test-client
 mutter-test-runner
+mutter-test-unit-tests
 mutter-all.test
 org.gnome.mutter.gschema.valid
 org.gnome.mutter.gschema.xml