Depend on the linkerconfig binary in buildbot-build.sh.

This now picks the prebuilt linkerconfig binary on master-art, and the
source binary on the full platform branches.

Test: art/tools/buildbot-build.sh {--target,--host}
  on master-art and in AOSP master
Bug: 162819454
Change-Id: Ieee62aa683232659b07c647537339fe73de77077
1 file changed