Production - Fix build on OS X with homebrew packages

- Fixed missing include for python. 
- Fixed compilation error in OSG 3.2, removed some optimizations for OSX that were specific to a single standard library, though additional changes should be made. 
- Fixed OSG definition that did not exist, though the newly selected definition may need to be checked by someone more familiar.
- Fixed type naming of CodecID, which does not exist to AVCodecID