net/samba423: Fix SIGABRT in bsd_attr_list()
After FORTIFY_SOURCE was added for https://bugzilla.samba.org/show_bug.cgi?id=16040, which landed in Samba 4.23.7, the net/samba423 port started crashing quite soon after startup.
It turns out that bsd_attr_list() does a number of overlapping strncpy() calls, and this is undefined behavior.
PR: 295130
Approved by: samba (kiwi)
Sponsored by: Klara, Inc.