Janic Duplessis 7d06c35d1c Run install third party script as part of the xcode build ...

Summary:
Runs the `./ios-install-third-party.sh` script as part of the build process to avoid having to do it manually when building the cxx bridge with xcode. Also added the third-party dir to gitignore.

**Test plan**
Tested that just building works when the third-party dir is missing.
Closes https://github.com/facebook/react-native/pull/12694

Differential Revision: D4658165

Pulled By: ericvicenti

fbshipit-source-id: 9b51b88eb26637b19266bf85deafa41e3a77a645

2017-03-06 00:00:55 -08:00

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project.pbxproj

Run install third party script as part of the xcode build

2017-03-06 00:00:55 -08:00