Correct the installation of the jobqueue header.

In the future we should consider using boost::scoped_ptr around the
jobqueue to hide the header from programs.

Change-Id: I0c048101ef469e499ecbf97dcd1614e51a516a0e
Merge branch 'fix_worker_install'

Change-Id: I721517b3675c4f02c056f2436ccd44054c680053