android: Update bundletool to 0.7.1

This is mostly to get the bugfix from [1], which will
allow the removal of 2 workarounds in our build system.
See [2]

[1] google/bundletool#32
[2] https://chrome-internal-review.googlesource.com/c/clank/internal/apps/+/719231

BUG=891931
R=agrieve@chromium.org, ntfschr@chromium.org

Change-Id: Ibc6f406ce3b2d920b19435e392b51181308e24a2
Reviewed-on: https://chromium-review.googlesource.com/c/1343107
Reviewed-by: agrieve <agrieve@chromium.org>
Commit-Queue: David Turner <digit@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#609711}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 7f3b69acd2e3211f940c407c0dcb4683b6d5e251

android/gyp/bundletool.py

@@ -17,7 +17,7 @@
  __file__, '..', '..', '..', '..', 'third_party', 'android_build_tools',
  'bundletool'))
 
-BUNDLETOOL_VERSION = '0.6.2'
+BUNDLETOOL_VERSION = '0.7.1'
 
 BUNDLETOOL_JAR_PATH = os.path.join(
  BUNDLETOOL_DIR, 'bundletool-all-%s.jar' % BUNDLETOOL_VERSION)