Show supported features in --version

[redfast00]

Currently, spotifyd --version only shows:

spotifyd 0.3.5

it would be nice if it also listed if this is an official release, and which options it was (and wasn't compiled with), so for example

spotifyd 0.3.5
slim
NO mpris support
...

[eladyn]

Sounds like a good idea. Would you be happy with something like:

spotifyd 0.3.5
features: MPRIS, keyring
audio backends: alsa, pulseaudio, rodio

That should be quite easy to implement. I'm not sure about the official release part. Is there a specific reason, you would like to see it in there?

[redfast00]

Sounds good! Is it possible to also list the features it was not compiled with maybe? If not, no worries.

As for the official release part: does not really matter to me but seemed useful, although I can't remember the usecase anymore now.