OpenSSL support follow-up changes

[anrossi]

Fix up a few things missing in the OpenSSL:

• Add tests for the release builds of OpenSSL
• Check the allocation size of AData->SecretSet[ProtLevel][Dir].Secret (currently sizeof(AUX_DATA) probably could be smaller)
• Add support for Hybrid keyshares during handshake (Fuzzer test fails with openssl tls backend due to insufficient buffer space #5116)
  OR
• Check the Schannel default keyshare and make sure to match it for the time being