dinit: show in --version if dinit was compiled with initgroups

[mobin-2008]

I think it's useful to allow checking it via dinit -v

Signed-off-by: Mobin "Hojjat" Aydinfar <[email protected]>

[davmac314]

I think it's useful to allow checking it via dinit -v

I disagree.

"intgroups" is just a function. It is not a feature. It will mean nothing to most users. If you want to list a feature based on USE_INITGROUPS being set, use an appropriate name for the feature.

The USE_INITGROUPS build option actually gates the use of two non-POSIX functions: initgroups and setgroups. But the feature that these implement support for is supplemental groups. (We should, really, rename USE_INITGROUPS to something more appropriate.)

The commit message is wrong, there is no -v option. It should be --version.

[davmac314]

If you can change the feature name to something suitable - maybe "supplemental-groups" - I'd like to get this for 0.17. We are almost there!