Added Youtube version 12.17 to gitignore file.

BUG=

Change-Id: I75caf87ecdd58ebc96bd119c6be60f43151d51c7
diff --git a/.gitignore b/.gitignore
index 8f75e04..2ece82e3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -50,6 +50,8 @@
 third_party/youtube/youtube.android_11.47.tar.gz
 third_party/youtube/youtube.android_12.10
 third_party/youtube/youtube.android_12.10.tar.gz
+third_party/youtube/youtube.android_12.17/
+third_party/youtube/youtube.android_12.17.tar.gz
 third_party/jctf
 third_party/jctf.tar.gz
 third_party/android_cts_baseline