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/R/default.nix

@@ -1,6 +1,6 @@
 { stdenv, fetchurl, bzip2, gfortran, libX11, libXmu, libXt, libjpeg, libpng
 , libtiff, ncurses, pango, pcre, perl, readline, tcl, texLive, tk, xz, zlib
-, less, texinfo, graphviz, icu, pkgconfig, bison, imake, which, jdk, openblas
+, less, texinfo, graphviz, icu, pkgconfig, bison, imake, which, jdk, blas, lapack
 , curl, Cocoa, Foundation, libobjc, libcxx, tzdata, fetchpatch
 , withRecommendedPackages ? true
 , enableStrictBarrier ? false
@@ -9,6 +9,8 @@
 , static ? false
 }:
 
+assert (!blas.is64bit) && (!lapack.is64bit);
+
 stdenv.mkDerivation rec {
   name = "R-3.6.3";
 
@@ -22,7 +24,7 @@ stdenv.mkDerivation rec {
   buildInputs = [
     bzip2 gfortran libX11 libXmu libXt libXt libjpeg libpng libtiff ncurses
     pango pcre perl readline texLive xz zlib less texinfo graphviz icu
-    pkgconfig bison imake which openblas curl tcl tk jdk
+    pkgconfig bison imake which blas lapack curl tcl tk jdk
   ] ++ stdenv.lib.optionals stdenv.isDarwin [ Cocoa Foundation libobjc libcxx ];
 
   patches = [
@@ -43,8 +45,8 @@ stdenv.mkDerivation rec {
     configureFlagsArray=(
       --disable-lto
       --with${stdenv.lib.optionalString (!withRecommendedPackages) "out"}-recommended-packages
-      --with-blas="-L${openblas}/lib -lopenblas"
-      --with-lapack="-L${openblas}/lib -lopenblas"
+      --with-blas="-L${blas}/lib -lblas"
+      --with-lapack="-L${lapack}/lib -llapack"
       --with-readline
       --with-tcltk --with-tcl-config="${tcl}/lib/tclConfig.sh" --with-tk-config="${tk}/lib/tkConfig.sh"
       --with-cairo