Before a protocol specific control block started to embed inpcb in self
(see 0aa120d52f, e68b379244, 483fe96511) this pointer used to point
at it.
Retain kf_sock_inpcb field in the struct kinfo_file in <sys/user.h>. The
exp-run detected a minimal use of the field in ports:
* sysutils/lsof - patched upstream
* net-mgmt/netdata - patch accepted upstream
* emulators/qemu-user-static - upstream master branch seems not using
the field anymore
We can keep the field around for some time, but eventually it may be
reused for something else.
PR: 277659 (exp-run)
Reviewed by: tuexen
Differential Revision: https://reviews.freebsd.org/D44491
1a8d176432