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/chelf/default.nix

@@ -0,0 +1,25 @@
+{ lib, stdenv, fetchFromGitHub }:
+
+stdenv.mkDerivation rec {
+  pname = "chelf";
+  version = "0.2.2";
+
+  src = fetchFromGitHub {
+    owner = "Gottox";
+    repo = "chelf";
+    rev = "v${version}";
+    sha256 = "0xwd84aynyqsi2kcndbff176vmhrak3jmn3lfcwya59653pppjr6";
+  };
+
+  installPhase = ''
+    mkdir -p $out/bin
+    mv chelf $out/bin/chelf
+  '';
+
+  meta = with lib; {
+    description = "change or display the stack size of an ELF binary";
+    homepage = "https://github.com/Gottox/chelf";
+    license = licenses.bsd2;
+    maintainers = with maintainers; [ dtzWill ];
+  };
+}