uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/tools/misc/hpcg/default.nix

@@ -0,0 +1,35 @@
+{ lib, stdenv, fetchurl, mpi } :
+
+stdenv.mkDerivation rec {
+  pname = "hpcg";
+  version = "3.1";
+
+  src = fetchurl {
+    url = "http://www.hpcg-benchmark.org/downloads/${pname}-${version}.tar.gz";
+    sha256 = "197lw2nwmzsmfsbvgvi8z7kj69n374kgfzzp8pkmk7mp2vkk991k";
+  };
+
+  dontConfigure = true;
+
+  enableParallelBuilding = true;
+
+  buildInputs = [ mpi ];
+
+  makeFlags = [ "arch=Linux_MPI" ];
+
+  installPhase = ''
+    mkdir -p $out/bin $out/share/hpcg
+
+    cp bin/xhpcg $out/bin
+    cp bin/hpcg.dat $out/share/hpcg
+  '';
+
+  meta = with lib; {
+    description = "HPC conjugate gradient benchmark";
+    homepage = "https://www.hpcg-benchmark.org";
+    platforms = platforms.linux;
+    license = licenses.bsd3;
+    maintainers = [ maintainers.markuskowa ];
+  };
+}
+