[hack] No longer install hhi files
[hack] No longer install hhi files

Summary:
These have been embedded into `hh_server` for a while, no more
need to ship them.

Test Plan: Looked at it.

Reviewed by: ptarjan

Differential Revision: D1441975

newrelic-forks/packaging,hhvm/packaging,hhvm/packaging,hhvm/packaging,bauerj/packaging,mathieujobin/packaging,N3X15/hhvm-build,autarch/packaging,N3X15/hhvm-build