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/development/tools/rep/default.nix

@@ -0,0 +1,30 @@
+{ lib, stdenv, fetchFromGitHub, asciidoc-full }:
+
+stdenv.mkDerivation rec {
+  pname = "rep";
+  version = "0.2.2";
+
+  src = fetchFromGitHub {
+    owner = "eraserhd";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "pqmISVm3rYGxRuwKieVpRwXE8ufWnBHEA6h2hrob51s=";
+  };
+
+  nativeBuildInputs = [
+    asciidoc-full
+  ];
+
+  postPatch = ''
+    substituteInPlace rc/rep.kak --replace '$(rep' '$('"$out/bin/rep"
+  '';
+  makeFlags = [ "prefix=$(out)" ];
+
+  meta = with lib; {
+    description = "Single-shot nREPL client";
+    homepage = "https://github.com/eraserhd/rep";
+    license = licenses.epl10;
+    platforms = platforms.all;
+    maintainers = [ maintainers.eraserhd ];
+  };
+}