Make script/build actually run gyp on Windows
Make script/build actually run gyp on Windows

We don't yet build, but we're getting closer.

lakshmi-srinivas/brightray,hokein/brightray,atom/brightray,deepak1556/brightray,tejaspathak/brightray,brave/brightray,bbondy/brightray,hokein/brightray,lakshmi-srinivas/brightray,paulcbetts/brightray,paulcbetts/brightray,lakshmi-srinivas/brightray,bbondy/brightray,tejaspathak/brightray,brave/brightray,deepak1556/brightray,atom/brightray