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/scs/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, blas, liblapack, gfortran, fixDarwinDylibNames }:
+{ stdenv, fetchFromGitHub, blas, lapack, gfortran, fixDarwinDylibNames }:
 
 stdenv.mkDerivation rec {
   pname = "scs";
@@ -20,7 +20,7 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = stdenv.lib.optional stdenv.isDarwin fixDarwinDylibNames;
 
-  buildInputs = [ blas liblapack gfortran.cc.lib ];
+  buildInputs = [ blas lapack gfortran.cc.lib ];
 
   doCheck = true;