Sort output of *NativeFunctions.h (#67046)
Summary:
This ensures deterministic output, allowing systems like ccache to be
more effective.
cc ezyang bhosmer bdhirsh
Pull Request resolved: https://github.com/pytorch/pytorch/pull/67046
Reviewed By: VitalyFedyunin
Differential Revision: D31896114
Pulled By: bdhirsh
fbshipit-source-id: d29ef0cf6c7e3408b104c5239b620eaa24327088
