Adjust build and test scripts for handling ICU prebuilts.

Test: run-tests, buildbot-build.sh, run-libcore-tests, run-libjdwp-tests, gtests (on device and host)
Test: gart/tools/golem/build-target.sh, and art/build/apex/runtests.sh.
Bug: 157734636
Bug: 129332183
Change-Id: I8ae469ade6adb0b9a2b7617598a4e68796a0f8d3
5 files changed