EXFLAG_PROXY
x->ex_flags |= EXFLAG_PROXY;
if (subject->ex_flags & EXFLAG_PROXY) {
if (ctx->xsc == NULL && cert->ex_flags & EXFLAG_PROXY) {
if (!allow_proxy_certs && (x->ex_flags & EXFLAG_PROXY)) {
if (x->ex_flags & EXFLAG_PROXY) {