openssl: add SSL_ERROR_SYSCALL case

[nokute78]

This patch is to print errno when openssl API returns SSL_ERROR_SYSCALL.
There are several issues that SSL_ERROR_SYSCALL(=5) returned. #6431 #5705

Example SSL error log

[2022/11/21 11:57:45] [error] [tls] error: error:00000005:lib(0):func(0):DH lib

The value of SSL_ERROR_SYSCALL

$ grep SSL_ERROR_SYSCALL /usr/include/openssl/*
/usr/include/openssl/ssl.h:# define SSL_ERROR_SYSCALL               5/* look at error stack/return

OpenSSL man page

https://www.openssl.org/docs/man3.1/man3/SSL_get_error.html

SSL_ERROR_SYSCALL
Some non-recoverable, fatal I/O error occurred. The OpenSSL error queue may contain more information on the error. 
For socket I/O on Unix systems, consult errno for details. 
If this error occurs then no further I/O operations should be performed on the connection and SSL_shutdown() must not be called.

This value can also be returned for other errors, check the error queue for details.

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Testing
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• [N/A] Example configuration file for the change
• [N/A] Debug log output from testing the change

• [N/A] Attached Valgrind output that shows no leaks or memory corruption was found

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• [N/A] Attached local packaging test output showing all targets (including any new ones) build.

Documentation

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Backporting

• [N/A] Backport to latest stable release.

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