compat_kex_proposal
char *compat_kex_proposal(struct ssh *, const char *);
prop[i] = compat_kex_proposal(ssh, cp);
result = compat_kex_proposal(&ssh, tests[i].in);
result = compat_kex_proposal(&ssh, in);
result = compat_kex_proposal(&ssh, in);
result = compat_kex_proposal(&ssh, in);