libc/gen: fix hack for previously unsupported lint initializers

Supported since init.c 1.182 from 2021-03-30.

Avoid complicated arithmetic involving NULL.

simplify cast.

add a couple of casts.

Get rid of all sysc_init_field uses - initialize fields directly in C99
notation.

When creating the descriptions for the "user" node, advance the output
pointer properly.

Use C89 definitions.
Remove use of __P

PR/45989: Martin Husemann: lint invocation does include -w only on i386

- turn lint -w for all the platforms after fixing the lint warnings.
- add _DIAGASSERTS() for casts that would assign values t

PR/45989: Martin Husemann: lint invocation does include -w only on i386

- turn lint -w for all the platforms after fixing the lint warnings.
- add _DIAGASSERTS() for casts that would assign values to types that
would not fit.
- change types, add casts
- change into ansii prototypes
- turn on _DIAGNOSTIC for libc (during current, to be eliminated for release
builds)

approved by core@

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setup _POSIX2_C_BIND per SUSv3, from Andy Shevchenko

complete constification of the sysctl() user side

WARNS=4

Replaced strncpy with strlcpy. Thanks to Peter Postma who
pointed them our in PR #25762. Approved by christos@NetBSD.org.

Remove dynamic sysctl node version 0 from the tree. It seemed okay at
first, but quickly showed its shortcomings. The version 1 node we're
now using should be good for a while.

Avoid using preprocessing conditionals in a macro argument list at least
as long as all ports have not yet been converted to using gcc 3.3.3.

Build bug discovered when building for vax.

Descriptions for user.* sysctl nodes. Mostly copied from sysctl(3).

Introduce sysc_init_field() and use it to make the code a little less ugly.
Also, fix another gcc2-unfriendly initialization.

Modify this so that it actually compiles with gcc2.

Unwind the nested designators for fields within structs within structs
(or unions). This should really be put back once we're all using gcc3
for everything, since that makes it look a *lot* cleaner.

Description framework for user-level sysctl nodes. Still haven't
written the descriptions.

New node version and layout. This should take care of the netbsd32
emulation problem, formalizes the versioning (should it ever be needed
again), and provides a slot for descriptions.

The new sysctl query interface returns the same information as the old
one, but you must pass in an empty node that indicates the version
you're using.

Remove my private hack for watching how sysctl works. That's not
supposed to be there.

Tango on sysctl_createv() and flags. The flags have all been renamed,
and sysctl_createv() now uses more arguments.

oops

Adapt userland sysctl goop to new world order, permitting dynamic
discovery.