Add FreeBSD support

[lbartoletti]

This line allows us to build and use choosenim on FreeBSD.

Previously this error was raised:

/tmp/nimble_50804/githubcom_dom96choosenim/src/choosenimpkg/utils.nim(167, 5) Error: expression '' has no type (or is ambiguous)

[dom96]

The problem I think we'll have is that we'd need to build choosenim for FreeBSD. I guess some might want to build it themselves anyway.

[lbartoletti]

Sorry, I don't understand the problem here. Do you want a CI or a package for FreeBSD?
If I can help, let me know.

[lbartoletti]

@dom96 I'll have some free time to chase nim (Free)BSD bugs and upgrade. How can I help you? Is this PR could be merged?

[dom96]

I think we can merge it, but yeah, you'll need to build choosenim yourself which kinda defeats the purpose :)

Unless you can get it into FreeBSD's package manager, that'd be cool

[lbartoletti]

I think we can merge it, but yeah, you'll need to build choosenim yourself which kinda defeats the purpose :)

Unless you can get it into FreeBSD's package manager, that'd be cool

I'm FreeBSD ports (aka package) committer 😉 and I want to take some time to add some nim package 😉

Thanks @dom96