Rip a bunch of ifdefs from speed. We know we can fork, have SIGALRM and
do not use lint.

ok miod@
Remove more FIPS tenticles.

ok beck@
KNF
When OPENSSL_C is not defined, apps_startup becomes a
signal(SIGPIPE, SIG_IGN) and apps_shutdown is a no-op. So just do that
instead.

ok beck@
unifdef -U LINT
More KNF, things that couldn't be verified with md5(1), and some whitespace
I missed on the first go around.
More KNF.
You want signals?!? I'll give you signals!!! Oh, and we have termios as
well...

ok beck@
add ERR_asprintf_error_data, A tool to be used to get rid of the far too
frequent construct of 30 lines of pointer and strlcat insanity followed
by an ERR_add_error_data. I will sweep through here like a chubby mongol
horde in the next few days pillaging crappy ERR_add_error_data's.
Oh and while we're at it fix the nasty vdata function to use something less
hard on the eyes.
ok jsing@
Remove some malloc/strlcpy/strlcat horror. Just use asprintf and avoid an
unchecked malloc at the same time.

ok beck@
Make it compile again.
More KNF.
obvious use after free was less obviously not a use after free.
who uses '\0' as a null pointer constant? fix my mistake and restore
original semantics.
unifdef MSDOS
ok miod@
rearrange a bit of code/comments
Bring back the SSL_OP_PKCS1_CHECK_* defines (defined to zero, as they already
were), after stumbling upon code (mis)using them in the wild.
Fix indentation.
Try to clean the maze of <openssl/bn.h> defines regarding the BN internals.

The intent of this change is to only keep support for two kind of architectures:
- those with 32-bit int and long, and 64-bit long long, where
  ``long * long -> long long'' multiplication routines are available.
- those with 64-bit int and long, and no 128-bit long long type.

This gets rid of the SIXTY_FOUR_BIT_LONG, SIXTY_FOUR_BIT (not the same!),
THIRTY_TWO_BIT, SIXTEEN_BIT and EIGHT_BIT defines.

After this change, the types and defines are as follows:

arch:           64bit           32bit           rationale
BN_LLONG        undefined       defined         defined if l * l -> ll
BN_ULLONG       undefined       u long long     result of BN_LONG * BN_LONG
BN_ULONG        u long          u int           native register size
BN_LONG         long            int             the same, signed
BN_BITS         128             64              size of 2*BN_ULONG in bits
BN_BYTES        8               4               size of 2*BN_ULONG in bytes
BN_BITS2        64              32              BN_BITS / 2

Tested on various 32-bit and 64-bit OpenBSD systems of various endianness.
KNF fixes
Use const char *.

Suggested by miod@