Some boot blocks too big now, only compare in big chunks if !_STANDALONE.

Drop the alignment check if __NO_STRICT_ALIGNMENT (x86, m68k, vax).

bcmp() / memcmp(): compare in uintptr_t sized chunks when it's easy to.

branches: 1.7.34; 1.7.38;
Casts and type changes to fix portability issues.
- int -> size_t
- adjust width of RHS of shift
- adjust widths of types

branches: 1.6.6;
Only include <assert.h> and <string.h> if !_KERNEL && !_STANDALONE

Actually... We need libkern.h also under _STANDALONE, so that
_DIAGASSERT gets defined. Fixes the mvmeppc libsa build.

- remove bcmp(9), bcopy(9), and bzero(9) from libkern since <sys/systm.h> has
macro which replace them with mem*() functions in #ifdef _KERNEL as noted
in man pages
- move declarations of bcopy(3) and bzero(3) into <lib/libsa/stand.h>
since they are still in libsa for some MD standalone sources
(I guess all bcmp(3) in standalone sources have been replaced with memcmp(3)
but they should be replaced with memcmp() anyway)

Add local declarations of bcmp() and bzero() because libkern.h no longer
provides those declarations.

It's possible that these can be removed later when we find out whether
these functions are actually needed in the kernel, but meanwhile, this
allows alpha, hp700 and the powerpc ports (who all build these as part
of libkern) to complete their builds.

branches: 1.2.20;
handle fortify, ansify.

Merge libkern + libc common files. As requested by core.