X509_delete_ext
ext = X509_delete_ext(pretmp, idx);
LCRYPTO_USED(X509_delete_ext);
X509_EXTENSION *X509_delete_ext(X509 *x, int loc);
LCRYPTO_ALIAS(X509_delete_ext);
X509_delete_ext(x, idx);
if (X509_delete_ext(x, 0) == NULL)
if (X509_delete_ext(x, 0) == NULL)