Undefined symbols for architecture arm64

[swrobel]

This error occurs when building with newer folly on React Native for iOS. Here is the issue from the Flipper repo with more detail:

Undefined symbols for architecture arm64:
  "___cxa_increment_exception_refcount", referenced from:
      folly::exception_ptr_get_type(std::exception_ptr const&) in libRCT-Folly.a(Exception.o)
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

It seems to be tied to this line of code, which was changed in recent versions of folly.

[yfeldblum]

I commented on facebook/flipper#2600. Presumably, flipper needs to update its build to account for the new direct dependency, on apple platforms, of folly on c++abi. Hopefully that should help.