ART: Enable testing on non-UTF-8 platform

Some of the test files use UTF-encoded sources. Ensure that javac
knows that instead of picking up the encoding of the host platform.

Ensure that testrunner reads test output with the correct
encoding.

Test: art/test/testrunner/testrunner.py -b --host -j 20 -t 2005
Change-Id: I4fe38fd32a12edcae56a7ba559df5828f0992428
2 files changed