message: utils/rsa.cpp: fix building with LibreSSL
diff: @@ -13,7 +13,7 @@ namespace {
  /* Forward compatibility functions if libssl < 1.1.0. */
  -#if OPENSSL_VERSION_NUMBER < 0x10100000L
  +#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
  int RSA_set0_key(RSA *r, BIGNUM *n, BIGNUM *e, BIGNUM *d)
  {
  