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/clac/default.nix

@@ -0,0 +1,28 @@
+{ lib, stdenv, fetchFromGitHub }:
+
+stdenv.mkDerivation rec {
+  pname = "clac";
+  version = "0.3.3";
+
+  src = fetchFromGitHub {
+    owner = "soveran";
+    repo = "clac";
+    rev = version;
+    sha256 = "rsag8MWl/udwXC0Gj864fAuQ6ts1gzrN2N/zelazqjE=";
+  };
+
+  makeFlags = [ "PREFIX=$(out)" ];
+
+  postInstall = ''
+    mkdir -p "$out/share/doc/${pname}"
+    cp README* LICENSE "$out/share/doc/${pname}"
+  '';
+
+  meta = with lib; {
+    description = "Interactive stack-based calculator";
+    homepage = "https://github.com/soveran/clac";
+    license = licenses.bsd2;
+    maintainers = with maintainers; [ raskin ];
+    platforms = platforms.unix;
+  };
+}