bug: Replace broken Homebrew formula

[helpermethod]

This PR replaces the autogenerated Homebrew formula with a manually crafted one.

Major differences to the autogenerated one:

• it incorporates native extensions depending on the architecture
• it removes the broken formula
• it generates var/version and var/version_native files during install

Release automation will be the subject of a future pull request.

[helpermethod]

Just noticed that the platform file is missing. Should be easy to fix.

[helpermethod]

Done. Tested locally and works perfectly.