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NSS_BUFLEN_PASSWD is not defined on FreeBSD.  Use
sysconf(_SC_GETPW_R_SIZE_MAX) instead, as per POSIX.

Use a dynamically allocated buffer instead of trying to cram all of
the logic into the declarations.  This will come in useful later
anyway.
Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Bjoern Jacke <bjacke@samba.org>
(cherry picked from commit 847208cd)