Make sure FindLAPACK finds the same BLAS library (#49647)
Summary:
BLAS library is found by cmake/Dependencies.cmake and then
LAPACK library is found by FindLAPACK.cmake which in turn calls
FindBLAS.cmake. This means that we are searching for BLAS twice
and they might be different things. By setting a few variables,
this can be avoided.
cc seemethere
Pull Request resolved: https://github.com/pytorch/pytorch/pull/49647
Reviewed By: seemethere, ejguan
Differential Revision: D29943680
Pulled By: malfet
fbshipit-source-id: 3cbc350ea645a1a28dd92c19e5ee7f9eecdeff59
