FreeBSD/src e4478d7 (r343161)include/protocols talkd.h, libexec/talkd talkd.c

Use a private definition of osockaddr rather then relying on type
namespace polution in sys/socket.h.

Also remove support for operation on 4.3BSD.

PR:             224529
Differential Revision:  https://reviews.freebsd.org/D14505
DeltaFile
+12-3include/protocols/talkd.h
+1-5usr.bin/talk/invite.c
+1-5usr.bin/talk/look_up.c
+2-1libexec/talkd/talkd.c
+16-144 files

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