Minor updates for Pybind + OSL Reference test#339

Merged

jstone-lucasfilm merged 2 commits intoAcademySoftwareFoundation:v1.37from

autodesk-forks:adsk_contrib/ilm_137_updates_Jan14

Jan 14, 2020

Commits on Jan 14, 2020

Install osl include files into local reference directory. Small cleanup. (#719)
bernardkwok
committed
Merge in fix for debug python ((https://github.com/pybind/pybind11/pull/2025)
bernardkwok
committed