Same as https://github.com/atom/atom-shell/pull/867
Same as https://github.com/atom/atom-shell/pull/867

Indeed there are two places worth changing. After these two changes i am able to build Atom-Shell using Pyhon installed by default (without adding to paths)
paulcbetts/brightray,tejaspathak/brightray,tejaspathak/brightray,brave/brightray,brave/brightray,paulcbetts/brightray,atom/brightray,atom/brightray,deepak1556/brightray,lakshmi-srinivas/brightray,bbondy/brightray,lakshmi-srinivas/brightray,deepak1556/brightray,lakshmi-srinivas/brightray,bbondy/brightray