Summary:
Fixes#20302 (For iOS)
Note:
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1. Checked the changes did not break CocoaPods integration.
2. The change for glog copying header into exported/ is to prevent build break for folly.
`folly/detail/Demangle.h` will try to use libstdc++'s demangle.h. Unfortunately, glog also has a demangle.h in source code. So I copy exported headers and only search headers in exported/ folder during build.
Pull Request resolved: https://github.com/facebook/react-native/pull/21976
Reviewed By: hramos
Differential Revision: D12818131
Pulled By: fkgozali
fbshipit-source-id: b3c637d09d1b3adde0ea15c82eb56e28f846885b
a70625abd7