wrappers/openssl: enable SSL_CTX_set_ecdh_auto for LibreSSL
wrappers/openssl: enable SSL_CTX_set_ecdh_auto for LibreSSL

This procedure is not no-op for older LibreSSL, and the ABI is kept for
newer versions, so there's no harm in enabling it unconditionally for
all LibreSSL versions.

dom96/Nim,dom96/Nim,dom96/Nim,dom96/Nim,dom96/Nim,dom96/Nim,dom96/Nim