Android patch: Android support for ICU4C tests.

On Android, the source tree is not available as the tests are cross
compiled. The ICU data itself is installed to a known system path, and
additional test data is found at paths relative to the test binary.

The upstream request is tracked at
https://unicode-org.atlassian.net/browse/ICU-13849.

Bug: 120776993
Test: treehugger
Change-Id: I86ca4d5545970ab2bf42916e4387071cc9e99ae9
1 file changed