include/i386: fix release builds

Add a target to ensure the presence of /usr/include/i386
before we try to install files. In the buildworld/installworld path
it gets created different ways, but for

include/i386: fix release builds

Add a target to ensure the presence of /usr/include/i386
before we try to install files. In the buildworld/installworld path
it gets created different ways, but for distribute (used in releases)
we need it in the subdir.

(Creating of this the x86, pc, powerpc directories is far too complex.
We should look for ways to simplify it.)

Reported by: lwhsu
Fixes: a09ea2bbc3053d3b2afdb2f7444e5e57a96bb891

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amd64: -m32 support for machine/md_var.h

Install the i386 md_var.h under /usr/include/i386 on amd64 and include
when targeting i386.

This is a mostly kernel-only header required by procstat's ZFS s

amd64: -m32 support for machine/md_var.h

Install the i386 md_var.h under /usr/include/i386 on amd64 and include
when targeting i386.

This is a mostly kernel-only header required by procstat's ZFS support.
It is pulled in by the i386 machine/counter.h.

Reviewed by: jhb, imp

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amd64: -m32 support for machine/counter.h

Install the i386 counter.h under /usr/include/i386 on amd64 and include
when targeting i386.

This is a kernel-only header required by procstat's ZFS suppor

amd64: -m32 support for machine/counter.h

Install the i386 counter.h under /usr/include/i386 on amd64 and include
when targeting i386.

This is a kernel-only header required by procstat's ZFS support.

Reviewed by: jhb, imp

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amd64: -m32 support for machine/pcpu_aux.h

Install the i386 pcpu_aux.h under /usr/include/i386 on amd64 and include
when targeting i386.

This is a kernel-only header that is required by procstat's

amd64: -m32 support for machine/pcpu_aux.h

Install the i386 pcpu_aux.h under /usr/include/i386 on amd64 and include
when targeting i386.

This is a kernel-only header that is required by procstat's ZFS support.

Reviewed by: jhb, imp

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amd64: -m32 support for machine/pcpu.h

Install the i386 pcpu.h under /usr/include/i386 on amd64 and include
when targeting i386.

This is a kernel-only header and should not be required, but
procsta

amd64: -m32 support for machine/pcpu.h

Install the i386 pcpu.h under /usr/include/i386 on amd64 and include
when targeting i386.

This is a kernel-only header and should not be required, but
procstat's zfs support includes this with _KERNEL defined.

Reviewed by: jhb, imp

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amd64: -m32 support for machine/vmparam.h

Install the i386 vmparam.h under /usr/include/i386 on amd64 and include
when targeting i386.

Reviewed by: jhb, imp

amd64: -m32 support for machine/proc.h

Install the i386 proc.h under /usr/include/i386 on amd64 and include
when targeting i386.

Reviewed by: jhb, imp

amd64: -m32 support for machine/pmap.h

Install the i386 pmap.h under /usr/include/i386 on amd64 and include
when targeting i386.

Reviewed by: jhb, imp

amd64: -m32 support for machine/segments.h

Install the i386 segments.h under /usr/include/i386 on amd64 and include
when targeting i386.

Reviewed by: jhb, imp

amd64: -m32 support for machine/atomic.h

Install the i386 atomic.h under /usr/include/i386 on amd64 and include
when targeting i386.

Reviewed by: jhb, imp

amd64: -m32 support for machine/asm(macros).h

Install the i386 versions under /usr/include/i386 on amd64 and include
when targeting i386.

Reviewed by: jhb, imp

amd64: -m32 support for machine/profile.h

Install the i386 profile.h under /usr/include/i386 on amd64 and include
when targeting i386.

Reviewed by: jhb, imp

amd64: -m32 support for machine/cpufunc.h

Install the i386 cpufunc.h under /usr/include/i386 on amd64 and include
when targeting i386.

Reviewed by: jhb, imp

amd64: add an i386 include directory

This directory will hold i386-specific headers that are needed for
-m32 support on amd64 and where the amd64 and i386 cases have too
little in common for combini

amd64: add an i386 include directory

This directory will hold i386-specific headers that are needed for
-m32 support on amd64 and where the amd64 and i386 cases have too
little in common for combining them to make sense. Files to be
installed will come in later commits.

With the currently required set of files, this could be done with
another INCGROUP in include/Makefile, but at least one file that
might want -m32 support (ieeefp.h) conflicts with a files installed
in /usr/include.

Reviewed by: jhb, imp

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