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/compilers/serpent/default.nix

@@ -0,0 +1,42 @@
+{ lib, stdenv, fetchFromGitHub, ... }:
+
+stdenv.mkDerivation {
+  pname = "serpent";
+
+  # I can't find any version numbers, so we're just using the date
+  # of the last commit.
+  version = "2016-03-05";
+
+  src = fetchFromGitHub {
+    owner = "ethereum";
+    repo = "serpent";
+    rev = "51ee60857fe53c871fa916ef66fc1b4255bb9433";
+    sha256 = "1bns9wgn5i1ahj19qx7v1wwdy8ca3q3pigxwznm5nywsw7s7lqxs";
+  };
+
+  postPatch = ''
+    substituteInPlace Makefile --replace 'g++' '${stdenv.cc.targetPrefix}c++'
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin
+    mv serpent $out/bin
+  '';
+
+  meta = with lib; {
+    description = "Compiler for the Serpent language for Ethereum";
+    longDescription = ''
+      Serpent is one of the high-level programming languages used to
+      write Ethereum contracts. The language, as suggested by its name,
+      is designed to be very similar to Python; it is intended to be
+      maximally clean and simple, combining many of the efficiency
+      benefits of a low-level language with ease-of-use in programming
+      style, and at the same time adding special domain-specific
+      features for contract programming.
+    '';
+    homepage = "https://github.com/ethereum/wiki/wiki/Serpent";
+    license = with licenses; [ wtfpl ];
+    maintainers = with maintainers; [ ];
+    platforms = platforms.all;
+  };
+}