Summary: The system packages necessary on linux can vary even within .deb or .rpm space.  Add a getdeps.py feature to allow this, and use it in boost to mark that only centos_stream 8 has/needs the special boost169 packages

Reviewed By: HarveyHunt

Differential Revision: D32987046

fbshipit-source-id: 37f771159128e3a61fe4d6bb3d1444e95efd8a62