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/libraries/cgreen/default.nix

@@ -0,0 +1,29 @@
+{ stdenv, lib, fetchFromGitHub, cmake }:
+
+stdenv.mkDerivation rec {
+  pname = "cgreen";
+  version = "1.4.1";
+
+  src = fetchFromGitHub {
+    owner = "cgreen-devs";
+    repo = "cgreen";
+    rev = version;
+    sha256 = "sha256-aQrfsiPuNrEMscZrOoONiN665KlNmnOiYj9ZIyzW304=";
+  };
+
+  postPatch = ''
+    for F in tools/discoverer_acceptance_tests.c tools/discoverer.c; do
+      substituteInPlace "$F" --replace "/usr/bin/nm" "nm"
+    done
+  '';
+
+  nativeBuildInputs = [ cmake ];
+
+  meta = with lib; {
+    homepage = "https://github.com/cgreen-devs/cgreen";
+    description = "The Modern Unit Test and Mocking Framework for C and C++";
+    license = licenses.isc;
+    maintainers = [ maintainers.nichtsfrei ];
+    platforms = platforms.unix;
+  };
+}