stand: Fix inclusion of sys/blake3.h

sys/blake3.h is not safe to include in a standalone environment. It
assumes, unwisely, that there's only kernel or userland. The userland
choice is bad due to im

stand: Fix inclusion of sys/blake3.h

sys/blake3.h is not safe to include in a standalone environment. It
assumes, unwisely, that there's only kernel or userland. The userland
choice is bad due to imperfections in how we handle stdlib.h in this
environment (we wind up including the host's stdlib.h, it expects a
standard FreeBSD setup which the gymnastics we've done to create a
OpenSolaris/Illumos-like environment interfere with). Thankfully, in
this case we can just pretend to be the kernel for a little bit by
defining _KERNEL and the undefing it after we exit.

Sponsored by: Netflix
Reviewed by: kevans
Differential Revision: https://reviews.freebsd.org/D35750

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stand: Work around upstream issues in the standalone environment

There's a number of issues with including zfs_context.h from a
standalone environment. First, sys/uio_imp.h isn't at all safe for thi

stand: Work around upstream issues in the standalone environment

There's a number of issues with including zfs_context.h from a
standalone environment. First, sys/uio_imp.h isn't at all safe for this
environment, so define its guard #defines so that its contents are
skipped. Next, there's a problem including string.h to get the mem*
routines, so just define them here. ZFS_MODULE_PARAM_ARGS isn't defined
properly. I had wanted to define it when I was upstreaming changes to
include/os/freebsd/spl/sys/zfs_context.h, but they ran into resistance
so I'm defining that here now (it is also defined in zstd_shim.c, but
that will disappear once the issues it works around are
cleared). Finally, sys/sysmacros.h has to be included now before
sys/atomic.h, but upstream includes it after so include it here so that
the guards make the out-of-order includes in upstream irrelevant.

Sponsored by: Netflix
Reviewed by: kevans
Differential Revision: https://reviews.freebsd.org/D35750

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