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/welkin/default.nix

@@ -0,0 +1,38 @@
+{ lib, stdenv, fetchsvn, jre, makeWrapper }:
+
+stdenv.mkDerivation rec {
+  pname = "welkin";
+  version = "1.1";
+
+  src = fetchsvn {
+    url = "http://simile.mit.edu/repository/welkin";
+    rev = "9638";
+    sha256 = "1bqh3vam7y805xrmdw7k0ckcfwjg88wypxgv3njkkwyn7kxnfnqp";
+  };
+
+  sourceRoot = "welkin-r9638/tags/${version}";
+
+  nativeBuildInputs = [ makeWrapper ];
+  buildInputs = [ jre ];
+
+  installPhase = ''
+    mkdir -p $out/{bin,share}
+    cp -R . $out/share
+    cp $out/share/welkin.sh $out/bin/welkin
+    sed -e 's@\./lib/welkin\.jar@'"$out"'/share/lib/welkin.jar@' -i $out/bin/welkin
+    wrapProgram $out/bin/welkin \
+      --set JAVA_HOME ${jre}
+    chmod a+x $out/bin/welkin
+  '';
+
+  meta = {
+    description = "An RDF visualizer";
+    maintainers = with lib.maintainers; [
+      raskin
+    ];
+    hydraPlatforms = [];
+    sourceProvenance = with lib.sourceTypes; [ binaryBytecode ];
+    license = lib.licenses.free;
+    platforms = with lib.platforms; unix;
+  };
+}