Enable libflame as a LAPACK choice (#25795)
Summary:
libflame is BLIS's companion LAPACK from the FLAME project
Mimicks my ancient
https://gitlab.kitware.com/cmake/cmake/commit/f5bc78263e15f07fc1fed15d970d7ecf9e84f7cc
in cmake upstream
BLIS WWW: https://github.com/flame/libflame
Pull Request resolved: https://github.com/pytorch/pytorch/pull/25795
Differential Revision: D17286461
Pulled By: bddppq
fbshipit-source-id: 7cd0d27127c78563574791415e4a34f045df30df
