Enable ART source build.
This is the default when the make config step is run, but we need to do it explicitly here since soong.variables is hardcoded. Test: env OUT_DIR=out prebuilts/build-tools/build-prebuilts.sh on the aosp-build-tools branch Bug: 188922057 Change-Id: I1f85c01b76a212b5cdd1332fb2445b184f4ad759
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