linux.ko supports POSIX message queues using these symbols, so they need
to be exported rather than relying on the kernel linker's misfeature of
linking against debug or local symbols (which will soon be disabled by
default).
Reported by: mav
Reviewed by: zlei
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D53907
opt_compat.h is mentioned in nearly 180 files. In-progress network
driver compabibility improvements may add over 100 more so this is
closer to "just about everywhere" than "only some files" per the
guidance in sys/conf/options.
Keep COMPAT_LINUX32 in opt_compat.h as it is confined to a subset of
sys/compat/linux/*.c. A fake _COMPAT_LINUX option ensure opt_compat.h
is created on all architectures.
Move COMPAT_LINUXKPI to opt_dontuse.h as it is only used to control the
set of compiled files.
Reviewed by: kib, cem, jhb, jtl
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D14941
