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/graphics/eplot/default.nix

@@ -0,0 +1,52 @@
+{ lib, stdenv, fetchurl, gnuplot, ruby }:
+
+stdenv.mkDerivation {
+  pname = "eplot";
+  version = "2.09";
+
+  # Upstream has been contacted (2015-03) regarding providing versioned
+  # download URLs. Initial response was positive, but no action yet.
+  src = fetchurl {
+    url = "http://liris.cnrs.fr/christian.wolf/software/eplot/download/eplot";
+    sha256 = "0y9x82i3sfpgxsqz2w42r6iad6ph7vxb7np1xbwapx5iipciclw5";
+  };
+
+  ecSrc = fetchurl {
+    url = "http://liris.cnrs.fr/christian.wolf/software/eplot/download/ec";
+    sha256 = "0fg31g8mrcx14h2rjcf091cbd924n19z55iscaiflspifya30yhd";
+  };
+
+  buildInputs = [ ruby ];
+
+  dontUnpack = true;
+
+  installPhase = ''
+    runHook preInstall
+
+    mkdir -p "$out/bin"
+    cp "$src" "$out/bin/eplot"
+    cp "$ecSrc" "$out/bin/ec"
+    chmod +x "$out/bin/"*
+
+    sed -i -e "s|gnuplot -persist|${gnuplot}/bin/gnuplot -persist|" "$out/bin/eplot"
+
+    runHook postInstall
+  '';
+
+  meta = with lib; {
+    description = "Create plots quickly with gnuplot";
+    longDescription = ''
+      eplot ("easy gnuplot") is a ruby script which allows to pipe data easily
+      through gnuplot and create plots quickly, which can be saved in
+      postscript, PDF, PNG or EMF files. Plotting of multiple files into a
+      single diagram is supported.
+
+      This package also includes the complementary 'ec' tool (say "extract
+      column").
+    '';
+    homepage = "https://perso.liris.cnrs.fr/christian.wolf/software/eplot/";
+    license = licenses.gpl2Plus;
+    platforms = platforms.all;
+    maintainers = with maintainers; [ bjornfor shamilton ];
+  };
+}