ssl: remove SSL::SSLContext#tmp_ecdh_callback #394
Merged
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The underlying API SSL_CTX_set_tmp_ecdh_callback() was removed by
LibreSSL >= 2.6.1 and OpenSSL >= 1.1.0, in other words, it is not
supported by any non-EOL versions of OpenSSL.
The wrapper was initially implemented in Ruby 2.3 and has been
deprecated since Ruby/OpenSSL 2.0 (bundled with Ruby 2.4) with explicit
warning with rb_warn().