bpo-42941: raise SSL_ERROR_SYSCALL in sslproto.c

[sabersauce]

https://bugs.python.org/issue42941

https://bugs.python.org/issue42941

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[bingo-ctrl]

we got same issue,the infinite loop occurs when we got SSL_ERROR_SYSCALL error

[github-actions]

This PR is stale because it has been open for 30 days with no activity.

[akulakov]

@sabersauce Can you add a test? [edit]: it would go into Lib/test/test_asyncio/test_sslproto.py

[sc07kvm]

we got same issue,the infinite loop occurs when we got SSL_ERROR_SYSCALL error

[asvetlov]

sslproto was rewritten, please test against the main branch.