Michał Mokijewski e131fffb37 fix undefined_arch error in Xcode 10 beta (#19841)
Summary:
Fixes #19774

I spotted that in  Xcode 10 beta `CURRENT_ARCH` is set to string `undefined_arch`.  This PR will add fallback based on platform name (simulators are `x86_64` and everything since iPhone 5s is `arm64`).
Closes https://github.com/facebook/react-native/pull/19841

Differential Revision: D8619897

Pulled By: hramos

fbshipit-source-id: ed2ebaca105c6dcb40099f1a4aebe34d0660130c
2018-06-28 15:32:39 -07:00
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