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/ocaml-modules/piqi/default.nix

@@ -0,0 +1,34 @@
+{ lib, stdenv, fetchFromGitHub, ocaml, findlib, which, sedlex, easy-format, xmlm, base64 }:
+
+stdenv.mkDerivation rec {
+  version = "0.6.15";
+  pname = "piqi";
+  name = "ocaml${ocaml.version}-${pname}-${version}";
+
+  src = fetchFromGitHub {
+    owner = "alavrik";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "0v04hs85xv6d4ysqxyv1dik34dx49yab9shpi4x7iv19qlzl7csb";
+  };
+
+  nativeBuildInputs = [ ocaml findlib which ];
+  propagatedBuildInputs = [ sedlex xmlm easy-format base64 ];
+
+  strictDeps = true;
+
+  patches = [ ./no-ocamlpath-override.patch ];
+
+  createFindlibDestdir = true;
+
+  postBuild = "make -C piqilib piqilib.cma";
+
+  installTargets = [ "install" "ocaml-install" ];
+
+  meta = with lib; {
+    homepage = "https://piqi.org";
+    description = "Universal schema language and a collection of tools built around it";
+    license = licenses.asl20;
+    maintainers = [ maintainers.maurer ];
+  };
+}

pkgs/development/ocaml-modules/piqi/no-ocamlpath-override.patch

@@ -0,0 +1,17 @@
+diff -rupN piqi-0.6.12.orig/make/Makefile.ocaml piqi-0.6.12/make/Makefile.ocaml
+--- piqi-0.6.12.orig/make/Makefile.ocaml	2015-03-13 13:35:19.000000000 +0100
++++ piqi-0.6.12/make/Makefile.ocaml	2015-06-10 21:19:57.231000000 +0200
+@@ -1,13 +1,5 @@
+ OCAMLMAKEFILE := $(PIQI_ROOT)/make/OCamlMakefile
+ 
+-
+-OCAMLPATH := $(PIQI_BUILD)/lib/ocaml
+-ifeq ($(SYSTEM),$(filter $(SYSTEM),mingw mingw64))
+-OCAMLPATH := $(shell cygpath -w $(OCAMLPATH))
+-endif
+-export OCAMLPATH
+-
+-
+ # make sure camlp4o produces pretty-printed text instead of AST
+ export CAMLP4_O = $(CAMLP4)o -printer o
+