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/ipopt/default.nix

@@ -1,4 +1,6 @@
-{ stdenv, fetchurl, unzip, openblas, gfortran }:
+{ stdenv, fetchurl, unzip, blas, lapack, gfortran }:
+
+assert (!blas.is64bit) && (!lapack.is64bit);
 
 stdenv.mkDerivation rec {
   pname = "ipopt";
@@ -12,13 +14,13 @@ stdenv.mkDerivation rec {
   CXXDEFS = [ "-DHAVE_RAND" "-DHAVE_CSTRING" "-DHAVE_CSTDIO" ];
 
   configureFlags = [
-    "--with-blas-lib=-lopenblas"
-    "--with-lapack-lib=-lopenblas"
+    "--with-blas-lib=-lblas"
+    "--with-lapack-lib=-llapack"
   ];
 
   nativeBuildInputs = [ unzip ];
 
-  buildInputs = [ gfortran openblas ];
+  buildInputs = [ gfortran blas lapack ];
 
   enableParallelBuilding = true;