Have buildbot-build.sh create dummy hidden API lists

Buildbots are broken because the build now depends on the framework
generating hidden API lists, but these changes are not in the buildbot
manifest. Change the script to create dummy API lists. These are empty
but we do not want these rules to be enforced in the buildbot anyway.

Test: art/tools/buildbot-build.sh --target
Bug: 64382372
Change-Id: Ibb9f93bae44e3e342f6f3669a3856e19bf68ca13
1 file changed