Fix test_set_tmp_ecdh on OpenSSL 1.0.2
Fix test_set_tmp_ecdh on OpenSSL 1.0.2

reaperhulk/pyopenssl,r0ro/pyopenssl,pyca/pyopenssl,hynek/pyopenssl,mhils/pyopenssl,mhils/pyopenssl,r0ro/pyopenssl,aalba6675/pyopenssl,aalba6675/pyopenssl,hynek/pyopenssl,mitghi/pyopenssl,reaperhulk/pyopenssl,mitghi/pyopenssl