Fix access to symbols of the Testing ART APEX on the ART Buildbot.

The ART Buildbot build recipe was missing a step creating a symlink to
the ART APEX's symbols directory, as we use the Testing ART APEX,
which is not supported by the standard build recipes (on purpose).

Test: Check that stack traces are properly symbolized on the ART Buildbot
Bug: 141004137
Bug: 129534335
Change-Id: Ide9eda7019bdaa21732a8818cd6cebd40c7b4f77
1 file changed