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/applications/misc/xmr-stak/default.nix

@@ -0,0 +1,46 @@
+{ stdenv, stdenvGcc6, lib
+, fetchFromGitHub, cmake, libmicrohttpd_0_9_70, openssl
+, opencl-headers, ocl-icd, hwloc, cudatoolkit
+, devDonationLevel ? "0.0"
+, cudaSupport ? false
+, openclSupport ? true
+}:
+
+let
+  stdenv' = if cudaSupport then stdenvGcc6 else stdenv;
+in
+
+stdenv'.mkDerivation rec {
+  pname = "xmr-stak";
+  version = "2.10.8";
+
+  src = fetchFromGitHub {
+    owner = "fireice-uk";
+    repo = "xmr-stak";
+    rev = version;
+    sha256 = "0ilx5mhh91ks7dwvykfyynh53l6vkkignjpwkkss8ss6b2k8gdbj";
+  };
+
+  NIX_CFLAGS_COMPILE = "-O3";
+
+  cmakeFlags = lib.optional (!cudaSupport) "-DCUDA_ENABLE=OFF"
+    ++ lib.optional (!openclSupport) "-DOpenCL_ENABLE=OFF";
+
+  nativeBuildInputs = [ cmake ];
+  buildInputs = [ libmicrohttpd_0_9_70 openssl hwloc ]
+    ++ lib.optional cudaSupport cudatoolkit
+    ++ lib.optionals openclSupport [ opencl-headers ocl-icd ];
+
+  postPatch = ''
+    substituteInPlace xmrstak/donate-level.hpp \
+      --replace 'fDevDonationLevel = 2.0' 'fDevDonationLevel = ${devDonationLevel}'
+  '';
+
+  meta = with lib; {
+    description = "Unified All-in-one Monero miner";
+    homepage = "https://github.com/fireice-uk/xmr-stak";
+    license = licenses.gpl3Plus;
+    platforms = [ "x86_64-linux" ];
+    maintainers = with maintainers; [ fpletz bfortz ];
+  };
+}