Hide symbols in modes.h

ok tb@

Hit modes with the loving mallet of knfmt

ok tb@

Make internal header file names consistent

Libcrypto currently has a mess of *_lcl.h, *_locl.h, and *_local.h names
used for internal headers. Move all these headers we inherited from
OpenSSL to *_l

Make internal header file names consistent

Libcrypto currently has a mess of *_lcl.h, *_locl.h, and *_local.h names
used for internal headers. Move all these headers we inherited from
OpenSSL to *_local.h, reserving the name *_internal.h for our own code.
Similarly, move dtls_locl.h and ssl_locl.h to dtls_local and ssl_local.h.
constant_time_locl.h is moved to constant_time.h since it's special.

Adjust all .c files in libcrypto, libssl and regress.

The diff is mechanical with the exception of tls13_quic.c, where
#include <ssl_locl.h> was fixed manually.

discussed with jsing,
no objection bcook

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Remove assert() or OPENSSL_assert() of pointers being non-NULL. The policy
for libraries in OpenBSD is to deliberately let NULL pointers cause a SIGSEGV.
ok doug@ jsing@

tags as requested by miod and tedu

Get __STRICT_ALIGNMENT from <machine/endian.h> and decide upon it, rather
than defining it for not (i386 and amd64 (and sometimes s390)) only.

Compile-time tests remain compile-time tests, and runti

Get __STRICT_ALIGNMENT from <machine/endian.h> and decide upon it, rather
than defining it for not (i386 and amd64 (and sometimes s390)) only.

Compile-time tests remain compile-time tests, and runtime-test remain
runtime-test instead of being converted to compile-time tests, per matthew@'s
explicit demand (rationale: this makes sure the compiler checks your code even
if you won't run it).

No functional change except on s390 (which we don't run on) and vax (which we
run on, but noone cares about)

ok matthew@

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import OpenSSL-1.0.1c

import OpenSSL-1.0.0a