patch: make id conform SUSv3 and Coreutils id

[walter harms]

When using bb id you see:

  busybox id
uid=1000(walter) gid=100(users)

Coreutils id
uid=1000(walter) gid=100(users) groups=6(disk),14(uucp),16(dialout),33(video),100(users)
                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

missing is the extended group list, and for SUSv3 the -G switch that handels it

The patch will add that feature.
The results of "id -G" and "id -Gn" are now compareable to gnu id.

re,
  wh




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