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/ocaml-modules/lacaml/default.nix

@@ -1,6 +1,7 @@
-{ stdenv, fetchFromGitHub, darwin, ocaml, findlib, dune, base, stdio, liblapack, blas }:
+{ stdenv, fetchFromGitHub, darwin, ocaml, findlib, dune, base, stdio, lapack, blas }:
 
 assert stdenv.lib.versionAtLeast (stdenv.lib.getVersion ocaml) "4.05.0";
+assert (!blas.is64bit) && (!lapack.is64bit);
 
 stdenv.mkDerivation rec {
   pname = "ocaml${ocaml.version}-lacaml";
@@ -14,7 +15,7 @@ stdenv.mkDerivation rec {
   };
 
   buildInputs = [ ocaml findlib dune base stdio ];
-  propagatedBuildInputs = [ liblapack blas ] ++
+  propagatedBuildInputs = [ lapack blas ] ++
     stdenv.lib.optionals stdenv.isDarwin
       [ darwin.apple_sdk.frameworks.Accelerate ];