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/asc-key-to-qr-code-gif/default.nix

@@ -0,0 +1,45 @@
+{ lib, stdenv, fetchFromGitHub, imagemagick, qrencode
+, testQR ? false, zbar ? null
+}:
+
+assert testQR -> zbar != false;
+
+stdenv.mkDerivation {
+  pname = "asc-key-to-qr-code-gif";
+  version = "20180613";
+
+  src = fetchFromGitHub {
+    owner = "yishilin14";
+    repo = "asc-key-to-qr-code-gif";
+    rev = "5b7b239a0089a5269444cbe8a651c99dd43dce3f";
+    sha256 = "0yrc302a2fhbzryb10718ky4fymfcps3lk67ivis1qab5kbp6z8r";
+  };
+
+  dontBuild = true;
+  dontStrip = true;
+  dontPatchELF = true;
+
+  preInstall = let
+    substitutions = [
+      ''--replace "convert" "${imagemagick}/bin/convert"''
+      ''--replace "qrencode" "${qrencode.bin}/bin/qrencode"''
+    ] ++ lib.optional testQR [
+      ''--replace "hash zbarimg" "true"'' # hash does not work on NixOS
+      ''--replace "$(zbarimg --raw" "$(${zbar.out}/bin/zbarimg --raw"''
+    ];
+  in ''
+    substituteInPlace asc-to-gif.sh ${lib.concatStringsSep " " substitutions}
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp * $out/bin/
+  '';
+
+  meta = with lib; {
+    homepage = "https://github.com/yishilin14/asc-key-to-qr-code-gif";
+    description = "Convert ASCII-armored PGP keys to animated QR code";
+    platforms = platforms.unix;
+    maintainers = with maintainers; [ asymmetric ];
+  };
+}