.gitignore: Add test-driver

Change-Id: I08226c55afaebf0f2633a2a34879589e66fdf9ee
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
diff --git a/.gitignore b/.gitignore
index e85846d..5a63451 100644
--- a/.gitignore
+++ b/.gitignore
@@ -24,3 +24,4 @@
 ltmain.sh
 missing
 stamp-h1
+test-driver