FindBLAS/LAPACK: Provide information about used vendor
Some vendors have additional routines in BLAS/LAPACK. For example,
_64 suffixes for their BLAS routine implementation with Int64 type as integer. Also,
Intel MKL provides additional routines, which have an impact on the flow.
My suggestion is to add
LAPACK_VENDOR_NAME out variables which will have the name of the used vendors.