message: replace gcc version check with cxx abi check
diff: @@ -71,7 +71,7 @@ string DuckDB::Platform() {
  arch = "arm64";
  #endif
  -#if defined(__GNUC__) && __GNUC__ == 4
  +#if !defined(_GLIBCXX_USE_CXX11_ABI) || _GLIBCXX_USE_CXX11_ABI == 0
  if (os == "linux") {
  postfix = "_gcc4";
  }
  