message: avoid compiler warning
diff: @@ -756,4 +756,9 @@ TEST_CASE("Test csv type detection", "[copy]") {
  REQUIRE_NO_FAIL(con.Query("DROP TABLE test;"));
  }
  +// this avoids a compiler warning ('nfc_normalization' defined but not used [-Wunused-const-variable=])
  +void __dummy() {
  + (void) nfc_normalization;
  +}
  +
  #endif
  