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/security/pass/extensions/tomb.nix

@@ -0,0 +1,32 @@
+{ lib, stdenv, fetchFromGitHub, tomb }:
+
+stdenv.mkDerivation rec {
+  pname = "pass-tomb";
+  version = "1.3";
+
+  src = fetchFromGitHub {
+    owner = "roddhjav";
+    repo = "pass-tomb";
+    rev = "v${version}";
+    sha256 = "sha256-kbbMHmYmeyt7HM8YiNhknePm1vUaXWWXPWePKGpbU+o=";
+  };
+
+  buildInputs = [ tomb ];
+
+  dontBuild = true;
+
+  installFlags = [ "PREFIX=$(out)" ];
+
+  postFixup = ''
+    substituteInPlace $out/lib/password-store/extensions/tomb.bash \
+      --replace 'TOMB="''${PASSWORD_STORE_TOMB:-tomb}"' 'TOMB="''${PASSWORD_STORE_TOMB:-${tomb}/bin/tomb}"'
+  '';
+
+  meta = with lib; {
+    description = "Pass extension that keeps the password store encrypted inside a tomb";
+    homepage = "https://github.com/roddhjav/pass-tomb";
+    license = licenses.gpl3Plus;
+    maintainers = with maintainers; [ lovek323 fpletz tadfisher ];
+    platforms = platforms.unix;
+  };
+}