BUILD: ssl: fix ssl_sock_switchtx_cbk when no client_hello_cb

When building HAProxy with USE_QUIC and libressl 3.6.0, the
ssl_sock_switchtx_cbk symbol is not found because libressl does not
implement the client_hello_cb.

A ssl_sock_switchtx_cbk version for the servername callback is available
but wasn't exported correctly.
2 files changed