illumos build broken

[teutat3s]

Hello
thank you for working on this!

It seems 5ac8409 broke building this on illumos. To reproduce (latest pkgsrc-trunk, go117):

go install github.com/minio/mc@latest
...
go/pkg/mod/github.com/muesli/termenv@v0.11.1-0.20220204035834-5ac8409525e0/termenv_unix.go:27:29: multiple-value unix.Getpgrp() in single-value context

Sadly I'm not well-versed enough with go's unix std lib to say what special handling illumos would need to fix this.

EDIT:
just to confirm, when downgrading to a commit before this change it builds fine with:

git clone https://github.com/minio/mc
cd mc
go get github.com/muesli/termenv@afdc360daa456985264728b9de86992f20965e80
go build .

[muesli]

Thanks for the heads up! Fixing.

[teutat3s]

Wow that was fast, thank you very much!