`zstd_errors.h` and `zdict.h` are public headers, so they deserve to be in the root `lib/` directory with `zstd.h`, not mixed in with our private headers.
`zstd_errors.h` and `zdict.h` are public headers, so they deserve to be in the root `lib/` directory with `zstd.h`, not mixed in with our private headers.