Put the startup code in .text.startup

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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Use a constant array for the MIB. Newer LLVM decided that mib[] warranted
stack protections, with the obvious crash after the setup was done.
As a positive side effect, code size shrinks a bit.

Use __dead

Don't use argument as direct format string.

-delete prototypes which are already in <ssp/ssp.h>
-make __fail __noreturn__

Make threaded programs die correctly:

kill(getpid(), SIGFOO) -> raise(SIGFOO)

xprintf returns void.

- stack_protector.c doesn't really belong under sys/. Add a new directory
for misc support routines and put it there.
- Add a libc constructor. Use this to initialize threading and the
stack prot

- stack_protector.c doesn't really belong under sys/. Add a new directory
for misc support routines and put it there.
- Add a libc constructor. Use this to initialize threading and the
stack protector stuff. libpthread cannot be initialized safely using
its own constructor because libc and libpthread are deeply intertwined.
PR bin/37347

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