Allow an endpoint to read the alert data before closing the socket
If an alert gets sent and then we close the connection immediately with data still in the input buffer then a TCP-RST gets sent. Some OSs immediately abandon data in their input buffer if a TCP-RST is received - meaning the alert data itself gets ditched. Sending a TCP-FIN before the TCP-RST seems to avoid this. This was causing test failures in MSYS2 builds. Reviewed-by: Rich Salz <rsalz@openssl.org> Reviewed-by: Ben Kaduk <kaduk@mit.edu> (Merged from https://github.com/openssl/openssl/pull/4333)
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