`Metadata#arch` should return a valid Ohai architecture
The change introduced in #535 began returning architecture values of `:x86` and `:x64` on Windows. We would prefer the `*.metadata.json` files contain valid Ohai-based values of `i386` or `x86_64` as we use this data when publishing to backend systems like Artifactory. This saves unnecessary translation when fetching packages at install time.
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