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b29921cf93
We use a statically linked libcxx and don't expose any of the internal symbols. This theoretically allows us to namespace everything to avoid accidentally using the wrong version libcxx. Also, not having to worry about ABI stability allows libcxx to opt into optimized routines. But, since libcxx uses CMake and we don't, the mechanism to generate the __config_site file doesn't exist in GN. Instead, we check in a file that would have been generated for us by CMake. The file we check in though is a default with additional configuration. This version of the file makes it so that we opt into the unstable ABI (and get optimizations) and also namespace everything for Flutter so collisions are immediately flagged.