Revert "Revert "Revert "Revert "Update include path to torch/library.h"""" (#1948)
* Revert "Revert "Revert "Revert "Update include path to torch/library.h"… (#1947)"
This reverts commit 06ac47826b9c25a4104ef882ada3b848a056e7b4.
* Add torch_pin.
* Delete .torch_pin
Co-authored-by: Edward Z. Yang <ezyang@fb.com>