Add latest gmscore build to x20 dependencies.

Bug:
Change-Id: I6c1570affcef9d332b7e05c8a59719f6b920d9cb
diff --git a/.gitignore b/.gitignore
index 34c3afe..a599785 100644
--- a/.gitignore
+++ b/.gitignore
@@ -36,6 +36,8 @@
 third_party/gmscore/gmscore_v9.tar.gz
 third_party/gmscore/gmscore_v10
 third_party/gmscore/gmscore_v10.tar.gz
+third_party/gmscore/latest
+third_party/gmscore/latest.tar.gz
 third_party/gradle/gradle.tar.gz
 third_party/gradle/gradle
 third_party/jasmin.tar.gz