Remove a no-op actool
Remove a no-op actool

This effectively reverts https://github.com/travis-ci/travis-build/pull/157,
which was added as a hack to get around the problem where
`actool` was expected but not found.

This manifested in an error when the job was routed to Linux but
the build script was on Objective-C.

JuliaCI/travis-build,andyli/travis-build,akoeplinger/travis-build,kevmoo/travis-build,andyli/travis-build,JuliaCI/travis-build,craigcitro/travis-build,craigcitro/travis-build,jhass/travis-build,tmccombs/travis-build,jhass/travis-build,kevmoo/travis-build,akoeplinger/travis-build,tmccombs/travis-build