Update .gitignore file to handle ddmlib dependency

Bug:
Change-Id: I0b4808e022105dbbc015446a3ddfecd9babef2e4
diff --git a/.gitignore b/.gitignore
index 0090fb9..1241f78 100644
--- a/.gitignore
+++ b/.gitignore
@@ -54,6 +54,8 @@
 third_party/framework.tar.gz
 third_party/goyt
 third_party/goyt.tar.gz
+third_party/ddmlib
+third_party/ddmlib.tar.gz
 src/test/jack/ub-jack
 gradle-app.setting
 gradlew