CBLAS 64bit index build is not possible

[epsilon-0]

It seems like CBLAS does not have a index-64 API possible due to not having a variable used for function definition similar to LAPACKE, like lapack_int.

This creates a tiny problem as it seems like OpenBLAS and BLIS seem to have a index-64 header defined, but it becomes hard to
check if they are compatible as there is no reference implementation.

Is there any interest in creating such an API?
I would be willing to do a small PR which is going to try and extend it but I don't want to do that if there are other efforts already in progress, which might conflict with mine.

Thanks a lot,
Aisha

[epsilon-0]

Seems like there is an old issue also referencing this issue - #184

[epsilon-0]

Fixed 😸