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/applications/science/math/gmsh/default.nix

@@ -1,6 +1,8 @@
-{ stdenv, fetchurl, cmake, openblasCompat, gfortran, gmm, fltk, libjpeg
+{ stdenv, fetchurl, cmake, blas, lapack, gfortran, gmm, fltk, libjpeg
 , zlib, libGL, libGLU, xorg, opencascade-occt }:
 
+assert (!blas.is64bit) && (!lapack.is64bit);
+
 stdenv.mkDerivation rec {
   pname = "gmsh";
   version = "4.5.6";
@@ -10,7 +12,7 @@ stdenv.mkDerivation rec {
     sha256 = "0gs65bgr1ph5lz7r6manqj8cra30s7c94pxilkd2z0p5vq6fpsj6";
   };
 
-  buildInputs = [ openblasCompat gmm fltk libjpeg zlib libGLU libGL
+  buildInputs = [ blas lapack gmm fltk libjpeg zlib libGLU libGL
     libGLU xorg.libXrender xorg.libXcursor xorg.libXfixes xorg.libXext
     xorg.libXft xorg.libXinerama xorg.libX11 xorg.libSM xorg.libICE
     opencascade-occt