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/applications/misc/prevo/default.nix

@@ -0,0 +1,27 @@
+{ lib, symlinkJoin, prevo-tools, prevo-data, makeWrapper }:
+
+symlinkJoin rec {
+  name = "prevo-${version}";
+  inherit (prevo-tools) version;
+
+  paths = [ prevo-tools ];
+
+  nativeBuildInputs = [ makeWrapper ];
+
+  postBuild = ''
+    wrapProgram $out/bin/prevo \
+      --prefix XDG_DATA_DIRS : "${prevo-data}/share"
+  '';
+
+  meta = with lib; {
+    description = "offline version of the Esperanto dictionary Reta Vortaro";
+    longDescription = ''
+      PReVo is the "portable" ReVo, i.e., the offline version
+      of the Esperanto dictionary Reta Vortaro.
+    '';
+    homepage = "https://github.com/bpeel/prevodb";
+    license = licenses.gpl2Only;
+    maintainers = [ maintainers.das-g ];
+    platforms = platforms.linux;
+  };
+}