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b0113afd44
As reported by hebasto in https://github.com/bitcoin/bitcoin/issues/33545, newer libc++ versions implementing https://wg21.link/lwg3430 will no longer implicitly convert `fs::path` objects to `std::filesystem::path` objects when constructing `std::ifstream` and `std::ofstream` types. This is not a problem in Unix systems since `fs::path` objects use `std::string` as their native string type, but it causes compile errors on Windows which use `std::wstring` as their string type, since `fstream`s can't be constructed from `wstring`s. Fix the windows libc++ compile errors by adding a new `fs::path::std_path()` method and using it construct `fstream`s more portably. Additionally, delete `fs::path`'s implicit `native_string` conversion so these errors will not go undetected in the future, even though there is not currently a CI job testing Windows libc++ builds.