Disable the new run test modules when not building ART from sources.

Test: m droid SOONG_CONFIG_art_module_source_build=false
  in a platform tree
Test: art/build/build-art-module.sh
  on master-art
Test: lunch armv8-eng && art/tools/buildbot-build.sh
  on master-art
Bug: 172480615
Change-Id: Ic342e427d4911e2afce7d5bdf032cc9fdb5a3eb0
6 files changed