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/iml/default.nix

@@ -1,4 +1,4 @@
-{stdenv, autoreconfHook, fetchurl, gmp, openblas}:
+{stdenv, autoreconfHook, fetchurl, gmp, blas}:
 stdenv.mkDerivation rec {
   pname = "iml";
   version = "1.0.5";
@@ -8,7 +8,7 @@ stdenv.mkDerivation rec {
   };
   buildInputs = [
     gmp
-    openblas
+    blas
   ];
   nativeBuildInputs = [
     autoreconfHook
@@ -16,7 +16,7 @@ stdenv.mkDerivation rec {
   configureFlags = [
     "--with-gmp-include=${gmp.dev}/include"
     "--with-gmp-lib=${gmp}/lib"
-    "--with-cblas=-lopenblas"
+    "--with-cblas=-lblas"
   ];
   meta = {
     inherit version;