Reland "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: I77ee0f07fb2d73dff6465da905c966bffa2c5d47
5 files changed