Revert "PyTorch -> C++17 (#98209)" (#100497)
This reverts commit 8f0c825d36d6737000dd93bc86aa18761166a7b6.
https://github.com/pytorch/pytorch/pull/98209#issuecomment-1532099965, cannot revert normally due to unmerged linked diff
Fixes #ISSUE_NUMBER
Pull Request resolved: https://github.com/pytorch/pytorch/pull/100497
Approved by: https://github.com/huydhn, https://github.com/malfet
