Remove SIZE_MAX from limits.h. It was added years ago before we
had a proper stdint.h. No ports fallout. OK guenther@ miod@

We uniformly define size_t to be unsigned long and ssize_t to be long. Make
sure that SIZE_MAX and SSIZE_MAX are defined as constants with a matching
type on all are architectures.

ok millert@, matthew@

Move MB_LEN_MAX into the machine-independent sys/limits.h header,
rather than defining it separately for each architecture.
Also set it to 4, to accommodate for future UTF-8 support (rfc3629).

Diff by stsp, committing to catch the libc major bump

ok kettenis@, guenther@

Don't redefine SIZE_MAX

convert _FOO_SOURCE -> __FOO_VISIBLE in machine. OK deraadt@

the file is just a copy from 4.4bsd and thus ucb copyright is enough

Remove the advertising clause in the UCB license which Berkeley
rescinded 22 July 1999. Proofed by myself and Theo.

Add SIZE_MAX define. This is the same as SIZE_T_MAX but more portable.
The only OSes I've seen that use SIZE_T_MAX are 4.4BSD-derived whereas
SYSV things seem to use SIZE_MAX. It is also consistent with SSIZE_MAX
(which we already have). deraadt@ OK

Introduce a new file, machine/internal_types.h, to hold that specific arch
type characteristics.

internal_types.h will contain only settings invisible from standard C, e.g.,
in the __* or _[A-Z]* namespace, and be reused by files like limits.h.

This allows us to shorten machine/limits.h greatly, as all the common defines
are now in sys/limits.h, plus a small stub in internal_types.h.

Tested on all arches as far as I know.
Approved after discussion with art, millert, deraadt, and others.

CLK_TCK is not needed in the modern world; from espie@

Provide a few more constants to get on par with other arches and get
raidframe tools to compile; ok mickey@

missing L/UL; from netbsd

branches: 1.2.8;
Add defines for ULLONG_MAX, LLONG_MAX, and LLONG_MIN in terms of
UQUAD_MAX, QUAD_MAX, and QUAD_MIN respectively.

branches: 1.1.8;
some includes