This makes packages use lapack and blas, which can wrap different
BLAS/LAPACK implementations.
treewide: cleanup from blas/lapack changes
A few issues in the original treewide:
- can’t assume blas64 is a bool
- unused commented code
- Depend on `clfft`, `clblas`, and `opencl-clhpp` from nixpkgs (do not
fetch their sources)
- Add `buildDocs` flag. When set to true, arrayfire's docs will be
built using `doxygen`.
- Ensure that `cudatoolkit` is not evaluated on darwin.
- Move `python` from `buildInputs` to `nativeBuildInputs`.
- Meta: Shrink `description` and add `longDescription`.
- Meta: `homepage` formatting now adheres to nixpkgs manual.
- Meta: remove version
- A few minour syntactic-only changes.
