[ruby/openssl] ssl: fix errno display in exception messages

The errno reported in an OpenSSL::SSL::SSLError raised by
SSLSocket#accept and #connect sometimes does not match what SSL_accept()
or SSL_connect() actually encountered. Depending on the evaluation order
of arguments passed to ossl_raise(), errno may be overwritten by
peeraddr_ip_str().

While we could just fix peeraddr_ip_str(), we should avoid passing
around errno since it is error-prone. Replace rb_sys_fail() and
rb_io_{maybe_,}wait_{read,writ}able() with equivalents that do not read
errno.

https://github.com/ruby/openssl/commit/bfc7df860f

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