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/ocaml/obuild/default.nix

@@ -0,0 +1,33 @@
+{ lib, stdenv, fetchFromGitHub, ocaml }:
+
+stdenv.mkDerivation rec {
+  pname = "obuild";
+  version = "0.1.10";
+
+  src = fetchFromGitHub {
+    owner = "ocaml-obuild";
+    repo = "obuild";
+    rev = "obuild-v${version}";
+    sha256 = "sha256-dqWP9rwWmr7i3O29v/kipJL01B3qQozaToOFCdfTWZU=";
+  };
+
+  buildInputs = [ ocaml ];
+
+  buildPhase = ''
+    patchShebangs ./bootstrap
+    ./bootstrap
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp dist/build/obuild/obuild dist/build/obuild-from-oasis/obuild-from-oasis dist/build/obuild-simple/obuild-simple $out/bin/
+  '';
+
+  meta = {
+    homepage = "https://github.com/ocaml-obuild/obuild";
+    platforms = ocaml.meta.platforms or [ ];
+    description = "Simple package build system for OCaml";
+    license = lib.licenses.lgpl21;
+    maintainers = with lib.maintainers; [ volth ];
+  };
+}