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/virtualization/nixos-shell/default.nix

@@ -0,0 +1,30 @@
+{ lib, stdenv, nix, fetchFromGitHub, makeWrapper }:
+
+stdenv.mkDerivation rec {
+  pname = "nixos-shell";
+  version = "0.2.2";
+
+  src = fetchFromGitHub {
+    owner = "Mic92";
+    repo = "nixos-shell";
+    rev = version;
+    sha256 = "sha256-a3NJJv7MscAXhIdr07gEAQDYX0Qgb6ax5E8zSdCIgE8=";
+  };
+
+  nativeBuildInputs = [ makeWrapper ];
+
+  postInstall = ''
+    wrapProgram $out/bin/nixos-shell \
+      --prefix PATH : ${lib.makeBinPath [ nix ]}
+  '';
+
+  installFlags = [ "PREFIX=${placeholder "out"}" ];
+
+  meta = with lib; {
+    description = "Spawns lightweight nixos vms in a shell";
+    inherit (src.meta) homepage;
+    license = licenses.mit;
+    maintainers = with maintainers; [ mic92 ];
+    platforms = platforms.unix;
+  };
+}