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/yeshup/default.nix

@@ -0,0 +1,25 @@
+{ lib, stdenv, fetchFromGitHub }:
+
+stdenv.mkDerivation rec {
+  pname = "yeshup";
+  version = "unstable-2013-10-29";
+
+  src = fetchFromGitHub {
+    owner = "RhysU";
+    repo  = "yeshup";
+    rev = "5461a8f957c686ccd0240be3f0fd8124d7381b08";
+    sha256 = "1wwbc158y46jsmdi1lp0m3dlbr9kvzvwxfvzj6646cpy9d6h21v9";
+  };
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp -v yeshup $out/bin
+  '';
+
+  meta = with lib; {
+    homepage = "https://github.com/RhysU/yeshup";
+    platforms = platforms.linux;
+    license = licenses.cc-by-sa-30; # From Stackoverflow answer
+    maintainers = with maintainers; [ obadz ];
+  };
+}