Add android_ndk and catapult to .gitignore

BUG=angleproject:4026

Change-Id: I58ed4dea3c962c6a7c46deb69400b984d8a2ea30
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1918569
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>

.gitignore

diff --git a/.gitignore b/.gitignore
index d33402e..baba355 100644
--- a/.gitignore
+++ b/.gitignore
@@ -26,6 +26,8 @@
 .gclient_entries
 /src/tests/third_party/gles_conformance_tests
 /testing
+/third_party/android_ndk
+/third_party/catapult
 /third_party/cherry
 /third_party/fuchsia-sdk
 /third_party/gles1_conform