Remove duplicated Numa detection code. (#30628)
Summary:
cmake/Dependencies.cmake (https://github.com/pytorch/pytorch/blob/1111a6b8100386af82f5612ef551004188cf396c/cmake/Dependencies.cmake#L595-L609) has already detected Numa. Duplicated detection and variables may lead to
incorrect results.
Close https://github.com/pytorch/pytorch/issues/29968
Pull Request resolved: https://github.com/pytorch/pytorch/pull/30628
Differential Revision: D18782479
Pulled By: ezyang
fbshipit-source-id: f74441f03367f11af8fa59b92d656c6fa070fbd0
