Update compiler warning about ABI compatibility (#34472)
Summary:
3ac42677633a39c588c3fea19d2d4121f114edb3 already forces pytorch to use gcc>=5 everywhere
Pull Request resolved: https://github.com/pytorch/pytorch/pull/34472
Differential Revision: D20345134
Pulled By: ezyang
fbshipit-source-id: 3ce706405e8784cac5c314500466b5f988ad31bf
