FreeBSD: Unsupported advertiser setting: 'avahi'
### Current Situation

Avahi is available on FreeBSD... but homebridge won't start with advertiser set to "avahi".
`Error: Unsupported advertiser setting: 'avahi'`

With default advertiser, it leads to `Error: bind EADDRINUSE 0.0.0.0:5353` when Avahi is already running (and used by other softwares...)


### Proposed Change

Enable Avahi support for FreeBSD-based platforms.


### Additional Context

_No response_