Bug 1895086

This is essentially same issue as https://bugzilla.redhat.com/show_bug.cgi?id=1751407.

Description of problem:
ROOT complains of "standard library mismatch"

Version-Release number of selected component (if applicable):
6.22.02-3.fc33

How reproducible:
Always

Steps to Reproduce:
1.Write a C++ program

#include <iostream>
void hello()
{
  std::cout<<"hello\n";
}

2. Let ROOT complile and run

Actual results:
$ root -b -q hello.C++
   ------------------------------------------------------------------
  | Welcome to ROOT 6.22/02                        https://root.cern |
  | (c) 1995-2020, The ROOT Team; conception: R. Brun, F. Rademakers |
  | Built for linuxx8664gcc on Aug 17 2020, 12:46:52                 |
  | From tags/v6-22-02@v6-22-02                                      |
  | Try '.help', '.demo', '.license', '.credits', '.quit'/'.q'       |
   ------------------------------------------------------------------


Processing hello.C++...
Info in <TUnixSystem::ACLiC>: creating shared library /home/pliu/sandbox/./hello_C.so
Warning in cling::IncrementalParser::CheckABICompatibility():
  Possible C++ standard library mismatch, compiled with __GLIBCXX__ '20200826'
  Extraction of runtime standard library version was: '20201016'
hello


Expected results:
"hello" should be printed out without warning.

Additional info: