fix: Using js server when on musl

[alarmfox]

Hello,
I just saw you reverted the changes, but this pull request could be used as a base to make the integration with the official binaries. Maybe we can work a little on this one to create the beta branch you were mentioning in #408

Summary

Official binaries do not work on musl systems (ie. alpine or void). This PR detects the libc setting and fallbacks to the default js language-server.

Maybe, we can add a configuration option to allow users to decide to use the js version rather than the binary.

NB: i left commented the download functions for a different PR

[AntoineGS]

I will probably do an opt-in strategy for the binaries, so people can try it out and report back if it does not work but can easily switch back to the js version.
I will merge your changes to the new beta branch.
Feel free to do a checkout on it if you have anything else to add.

Also, thanks for the PR! Sorry rough day :)