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/system/dog/default.nix

@@ -0,0 +1,31 @@
+{lib, stdenv, fetchurl}:
+
+stdenv.mkDerivation rec {
+  pname = "dog";
+  version = "1.7";
+
+  src = fetchurl {
+    url = "http://archive.debian.org/debian/pool/main/d/dog/dog_${version}.orig.tar.gz";
+    sha256 = "3ef25907ec5d1dfb0df94c9388c020b593fbe162d7aaa9bd08f35d2a125af056";
+  };
+
+  patchPhase = ''
+    substituteInPlace Makefile \
+      --replace "gcc" "cc"
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin
+    mkdir -p $out/man/man1
+    cp dog.1 $out/man/man1
+    cp dog $out/bin
+  '';
+
+  meta = with lib; {
+    homepage = "http://lwn.net/Articles/421072/";
+    description = "cat replacement";
+    license = licenses.gpl2Plus;
+    maintainers = with maintainers; [ qknight ];
+    platforms = platforms.all;
+  };
+}