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E.g. I use out-gn/, and for me this change makes licenses.py run in 1.5
seconds rather than 3 seconds.

Our .gitignore ignores all top-level out* directories, so this script
should do the same.

Bug: None
Change-Id: I78cd1fea4c23d4990d52d2d521a41fe2267a2be6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2269317Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#783011}