remove SSL_CTX_set_ecdh_auto call (#1059)

They are a noop on 1.1.0+ and pyOpenSSL only supports 1.1.0+ now due to
cryptography versions

Author: reaperhulk

src/OpenSSL/SSL.py

@@ -724,12 +724,6 @@ def __init__(self, method):
         _openssl_assert(context != _ffi.NULL)
         context = _ffi.gc(context, _lib.SSL_CTX_free)
 
-        # Set SSL_CTX_set_ecdh_auto so that the ECDH curve will be
-        # auto-selected. This function was added in 1.0.2 and made a noop in
-        # 1.1.0+ (where it is set automatically).
-        res = _lib.SSL_CTX_set_ecdh_auto(context, 1)
-        _openssl_assert(res == 1)
-
         self._context = context
         self._passphrase_helper = None
         self._passphrase_callback = None