version: Include race build tag

[tcard]

When gathering info, tags are extracted directly from the -tags build setting. However, this doesn't include the race build tag that is implicitly set when building with -race.

With this change, we explicitly check the presence of the race build tag with conditional compilation, and include it in the tags list if present.

@roidelapluie @gotjosh

[beorn7]

I think we don't need //go:build !race etc. for this, see comment.

[beorn7]

I believe there is an easier way of doing this.

If the race detector is enabled, the buildInfo.Settings contain an entry -race=true. So we simply need something like

		if v.Key == "-race" && v.Value == "true" {

with the appropriate flow later to assemble the right tags string, as we cannot expect a certain order of the -tags key and the -race key.

[tcard]

Thanks, done at bd03eb9.

[roidelapluie]

i do not think that race is a build tag, should it be in its own category (and not shown when false)?