Add a build rule providing ICU .dat prebuilt under /system/etc/icu.

Define module `icu-data-art-test` copying ICU .dat prebuilt files into
/system/etc/icu, so that they can be found even if the Runtime APEX is
not available, by setting the environment variable
`ART_TEST_ANDROID_RUNTIME_ROOT` to "/system" on device.

This is a temporary change needed until both the ART Buildbot and
Golem fully support the Runtime APEX.

Test: Rely on the ART Buildbot.
Bug: 121117762
Bug: 119293618
Bug: 113373927
Change-Id: I4b9e74291095c8720b152227353c163bf8620215
1 file changed