[bitcoin/bitcoin] Boost or whatever compilation error (#13973)

I don’t think `copy_file` is the problem here.
It’s definitely been around since before 1.50.0, we even check for it in configure.ac:

https://github.com/bitcoin/bitcoin/blob/63f8b0128b2aac3b25c6ec4d2f5bda213033162a/configure.ac#L994

`path_traits` also exists in filesystem [V2 (1.47.0<)](https://www.boost.org/doc/libs/1_49_0/boost/filesystem/v2/path.hpp), however it looks like dispatch wasn't introduced until V3.

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