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/flatcc/default.nix

@@ -0,0 +1,34 @@
+{ lib, stdenv
+, fetchFromGitHub
+, cmake
+}:
+
+stdenv.mkDerivation rec {
+  pname = "flatcc";
+  version = "0.6.0";
+
+  src = fetchFromGitHub {
+    owner = "dvidelabs";
+    repo = "flatcc";
+    rev = "v${version}";
+    sha256 = "0cy79swgdbaf3zmsaqa6gz3b0fad2yqawwcnsipnpl9d8hn1linm";
+  };
+
+  nativeBuildInputs = [ cmake ];
+
+  cmakeFlags = [
+    "-DFLATCC_INSTALL=on"
+    "-DCMAKE_BUILD_TYPE=Release"
+  ];
+
+  NIX_CFLAGS_COMPILE = [
+    "-Wno-error=misleading-indentation"
+    "-Wno-error=stringop-overflow"
+  ];
+
+  meta = {
+    description = "FlatBuffers Compiler and Library in C for C ";
+    homepage = "https://github.com/dvidelabs/flatcc";
+    license = [ lib.licenses.asl20 ];
+  };
+}