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/qrupdate/default.nix

@@ -1,7 +1,8 @@
 { stdenv
 , fetchurl
 , gfortran
-, openblas
+, blas
+, lapack
 }:
 stdenv.mkDerivation {
   name = "qrupdate-1.1.2";
@@ -13,11 +14,11 @@ stdenv.mkDerivation {
   configurePhase =
     ''
       export PREFIX=$out
-      sed -i -e 's,^BLAS=.*,BLAS=-L${openblas}/lib -lopenblas,' \
-          -e 's,^LAPACK=.*,LAPACK=-L${openblas}/lib -lopenblas,' \
+      sed -i -e 's,^BLAS=.*,BLAS=-L${blas}/lib -lblas,' \
+          -e 's,^LAPACK=.*,LAPACK=-L${lapack}/lib -llapack,' \
           Makeconf
     ''
-    + stdenv.lib.optionalString openblas.blas64
+    + stdenv.lib.optionalString blas.is64bit
     ''
       sed -i Makeconf -e '/^FFLAGS=.*/ s/$/-fdefault-integer-8/'
     '';
@@ -30,7 +31,7 @@ stdenv.mkDerivation {
 
   installTargets = stdenv.lib.optionals stdenv.isDarwin [ "install-staticlib" "install-shlib" ];
 
-  buildInputs = [ gfortran openblas ];
+  buildInputs = [ gfortran blas lapack ];
 
   meta = with stdenv.lib; {
     description = "Library for fast updating of qr and cholesky decompositions";