[rtmpdump] GnuTLS API changed for gnutls_calc_dh_secret()

Since GnuTLS does not have an include-file in the /usr/include/-directory, there is a extern MP_t gnutls_calc_dh_secret(MP_t *priv, MP_t g, MP_t p); in the librtmp/dh.h. Now that the new function declaration is: *int gnutls_calc_dh_secret (bigint_t*ret_y, bigint_t * ret_x, bigint_t g, bigint_t prime, unsigned int q_bits) It makes RTMPDump barf a core on runtime. It compiles, as everything is ultimately declared as a void*, but the structures have changed internally. I'm sorry, I don't have a fix for that. Regards, Jari Turkia