suitesparse: link shared library against openblas

pkgs/development/libraries/science/math/suitesparse/default.nix

···
         for i in "$out"/lib/lib*.a; do
           ar -x $i
         done
-        gcc *.o --shared -o "$out/lib/libsuitesparse.so"
+        gcc *.o --shared -o "$out/lib/libsuitesparse.so" -lopenblas
     )
     for i in umfpack cholmod amd camd colamd spqr; do
       ln -s libsuitesparse.so "$out"/lib/lib$i.so;