ART: Add SOONG_ALLOW_MISSING_DEPENDENCIES to buildbot-build.sh

Automates requirement for building in master-art branch.

Test: art/tools/buildbot-build.sh --host -j 40 (in master-art)
Test: art/tools/buildbot-build.sh --host -j 40 (in aosp-master)
Change-Id: Iec006188cfc9bfb54c9676d5b2ae3e02f8ba0f67
1 file changed