treewide: use blas and lapack

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

pkgs/applications/science/math/calculix/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, gfortran, arpack, spooles, openblas }:
+{ stdenv, fetchurl, gfortran, arpack, spooles, blas, lapack }:
 
 stdenv.mkDerivation rec {
   pname = "calculix";
@@ -11,7 +11,7 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ gfortran ];
 
-  buildInputs = [ arpack spooles openblas ];
+  buildInputs = [ arpack spooles blas lapack ];
 
   NIX_CFLAGS_COMPILE = "-I${spooles}/include/spooles";