unconditionally align SSL payloads

Remove support for conditional payload alignment, since we would never
want to turn it off. Also, consistently use size_t for calculating the
alignment.

ok miod@
Add error handling for EVP_DigestInit_ex().

A few EVP_DigestInit_ex() calls were left alone since reporting an
error would change the public API.

Changed internal ssl3_cbc_digest_record() to return a value due to the above
change.  It will also now set md_out_size=0 on failure.

This is based on part of BoringSSL's commit to fix malloc crashes:
https://boringssl.googlesource.com/boringssl/+/69a01608f33ab6fe2c3485d94aef1fe9eacf5364

ok miod@
Now that we have Camellia support in libcrypto, bring in the SHA256 flavour of
the Camellia ciphersuites for TLS 1.2 introduced in RFC 5932. From OpenSSL HEAD.