setgroups problems on FreeBSD - proposed fix

[Björn JACKE]

Hi,

on FreeBSD setgroups() behaves a bit non-standard:

FreeBSD stores the effective gid at index 0 in the gid_t *list. This way the
first group in the list that Samba supplies to setgroups gets overwritten.

Attached there is a patch which fixes the setgroups() call also for FreeBSD
systems. Thanks to Volker for that!

This might also be the solution for bugzilla #3990.

Bjoern
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