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/misc/aescrypt/default.nix

@@ -0,0 +1,35 @@
+{ lib, stdenv, fetchurl, libiconv }:
+
+stdenv.mkDerivation rec {
+  version = "3.16";
+  pname = "aescrypt";
+
+  src = fetchurl {
+    url = "https://www.aescrypt.com/download/v3/linux/${pname}-${version}.tgz";
+    sha256 = "sha256-4uGS0LReq5dI7+Wel7ZWzFXx+utZWi93q4TUSw7AhNI=";
+  };
+
+  NIX_LDFLAGS = lib.optionalString stdenv.isDarwin "-liconv";
+
+  preBuild = ''
+    substituteInPlace src/Makefile --replace "CC=gcc" "CC?=gcc"
+    cd src
+  '';
+
+  installPhase= ''
+    mkdir -p $out/bin
+    cp aescrypt $out/bin
+    cp aescrypt_keygen $out/bin
+  '';
+
+  buildInputs = [ libiconv ];
+
+  meta = with lib; {
+    description = "Encrypt files with Advanced Encryption Standard (AES)";
+    homepage    = "https://www.aescrypt.com/";
+    license     = licenses.gpl2;
+    maintainers = with maintainers; [ lovek323 qknight ];
+    platforms   = lib.platforms.all;
+    hydraPlatforms = with platforms; unix;
+  };
+}