ssl: adjust "certificate verify failed" error on SSL_ERROR_SYSCALL #640
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Enrich SSLError's message with the low-level certificate verification result, even if SSL_get_error() returns SSL_ERROR_SYSCALL. This is currently done on SSL_ERROR_SSL only.
According to the man page of SSL_get_error(), SSL_ERROR_SYSCALL may be returned for "other errors, check the error queue for details". This apparently means we have to treat SSL_ERROR_SYSCALL, if errno is not set, as equivalent to SSL_ERROR_SSL.
Fixes: #606