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This configures bundletool.py to print bundletool.jar's stdout if it's
invoked as a script. This is necessary for commands like "bundletool
version" which print to stdout. This does not change the default
behavior for the programmatic interface.

Bug: 1165897
Test: build/android/gyp/bundletool.py version
Change-Id: I0422c46bcdb0399d63b205ca7b92db9c50de7851
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2625747
Commit-Queue: Nate Fischer <ntfschr@chromium.org>
Commit-Queue: Peter Wen <wnwen@chromium.org>
Auto-Submit: Nate Fischer <ntfschr@chromium.org>
Reviewed-by: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842754}