Function nginx::SSL_CTX_sess_set_get_cb

pub unsafe extern "C" fn SSL_CTX_sess_set_get_cb(
    ctx: *mut SSL_CTX, 
    get_session_cb: Option<unsafe extern "C" fn(ssl: *mut ssl_st, data: *const c_uchar, len: c_int, copy: *mut c_int) -> *mut SSL_SESSION>
)