Non-darwin, non-linux builds are broken

[knz]

The code has 4 instances of // +build darwin linux which should be !windows instead.

Needed for cockroachdb/cockroach#67216.

[bufdev]

These tags are as expected - we want the build to by only for Darwin and Linux, not for not-windows. Can you explain the issue?

[knz]

Buf is broken on openbsd, freebsd, dragonfly with the current code. With my fix, it works just fine on these platforms. Why the restriction?

[bufdev]

Just not to duplicate the comment, I commented on cockroachdb/cockroach#67216 (comment) with what amounts to the response to this

[knz]

All the Unix systems supported by Go are compatible with the code already in buf. There's absolutely no variation in these particular features.

[bufdev]

Fixed on master in #364 and #365, this will be part of the next release.