The dtls1_output_cert_chain function no longer exists so remove it from
ssl_locl.h

Reviewed-by: Tim Hudson <tjh@openssl.org>
Check return value of ssl3_output_cert_chain

(cherry picked from commit 66f96fe2d519147097c118d4bf60704c69ed0635)

Reviewed-by: Tim Hudson <tjh@openssl.org>