openssl s_server: don't use sendto() with connected UDP socket
Fixes #7675 On macOS, if you call `connect()` on a UDP socket you cannot then call `sendto()` with a destination, otherwise it fails with Err#56 ('socket is already connected'). By calling `BIO_ctrl_set_connected()` on the wbio we can tell it that the socket has been connected and make it call `send()` rather than `sendto()`. Reviewed-by:Matt Caswell <matt@openssl.org> Reviewed-by:
Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com> (Merged from https://github.com/openssl/openssl/pull/7676)
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