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/development/libraries/science/math/cholmod-extra/default.nix

@@ -1,10 +1,5 @@
-{ stdenv, fetchFromGitHub, gfortran, suitesparse, openblas }:
-let
-  suitesparse_ = suitesparse;
-in let
-  # SuiteSparse must use the same openblas
-  suitesparse = suitesparse_.override { inherit openblas; };
-in stdenv.mkDerivation rec {
+{ stdenv, fetchFromGitHub, gfortran, suitesparse, blas, lapack }:
+stdenv.mkDerivation rec {
   pname = "cholmod-extra";
   version = "1.2.0";
 
@@ -15,10 +10,10 @@ in stdenv.mkDerivation rec {
     sha256 = "0hz1lfp0zaarvl0dv0zgp337hyd8np41kmdpz5rr3fc6yzw7vmkg";
   };
 
-  buildInputs = [ suitesparse gfortran openblas ];
+  buildInputs = [ suitesparse gfortran blas lapack ];
 
-  buildFlags = [
-    "BLAS=-lopenblas"
+  makeFlags = [
+    "BLAS=-lcblas"
   ];
 
   installFlags = [