Function nginx::SSL_set_psk_server_callback

pub unsafe extern "C" fn SSL_set_psk_server_callback(
    ssl: *mut SSL, 
    psk_server_callback: Option<unsafe extern "C" fn(ssl: *mut SSL, identity: *const c_char, psk: *mut c_uchar, max_psk_len: c_uint) -> c_uint>
)