Remove the get_rfc*_prime_*() API

Inconsistently named with the rest of the API, so OpenSSL 1.1 introduced
the same functions with a BN_ prefix. We'll keep the latter.

ok jsing

Pull BIGNUM constants out of get_* function bodies

The get_rfc*_prime_* functions will be removed. The constants will remain
for the BN_get_rfc*_prime_* functions. Make the latter call BN_bin2bn()
d

Pull BIGNUM constants out of get_* function bodies

The get_rfc*_prime_* functions will be removed. The constants will remain
for the BN_get_rfc*_prime_* functions. Make the latter call BN_bin2bn()
directly on these constants rather than going through get_*. This avoids
some overlong lines. Also KNF for some comments.

Reduces the diff I currently carry by quite a bit.

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Hide symbols in bn

ok tb@

Provide BN_get_rfc2409_prime_*() and BN_get_rfc3526_prime_*().

tags as requested by miod and tedu

Get the public headers from the official place with <openssl/ >
from Brent Cook

Emergency knfectomie requested by tedu@.

import of OpenSSL 0.9.8h