remove no-op C10_DISABLE_NUMA preprocessor flag (#98243)
Nothing reads this, so setting it does nothing.
Differential Revision: [D44642070](https://our.internmc.facebook.com/intern/diff/D44642070/)
**NOTE FOR REVIEWERS**: This PR has internal Meta-specific changes or comments, please review them on [Phabricator](https://our.internmc.facebook.com/intern/diff/D44642070/)!
Pull Request resolved: https://github.com/pytorch/pytorch/pull/98243
Approved by: https://github.com/PaliC
