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/compilers/mono/llvm.nix

@@ -0,0 +1,51 @@
+{ stdenv
+, lib
+, fetchFromGitHub
+, groff
+, cmake
+, python2
+, perl
+, libffi
+, libbfd
+, libxml2
+, valgrind
+, ncurses
+, zlib
+}:
+
+stdenv.mkDerivation {
+  pname = "llvm";
+  version = "3.6-mono-2017-02-15";
+
+  src = fetchFromGitHub {
+    owner = "mono";
+    repo = "llvm";
+    rev = "dbb6fdffdeb780d11851a6be77c209bd7ada4bd3";
+    sha256 = "07wd1cs3fdvzb1lv41b655z5zk34f47j8fgd9ljjimi5j9pj71f7";
+  };
+
+  nativeBuildInputs = [ cmake ];
+  buildInputs = [ perl groff libxml2 python2 libffi ] ++ lib.optional stdenv.isLinux valgrind;
+
+  propagatedBuildInputs = [ ncurses zlib ];
+
+  # hacky fix: created binaries need to be run before installation
+  preBuild = ''
+    mkdir -p $out/
+    ln -sv $PWD/lib $out
+  '';
+  postBuild = "rm -fR $out";
+
+  cmakeFlags = with stdenv; [
+    "-DLLVM_ENABLE_FFI=ON"
+    "-DLLVM_BINUTILS_INCDIR=${libbfd.dev}/include"
+  ] ++ lib.optional (!isDarwin) "-DBUILD_SHARED_LIBS=ON";
+
+  meta = {
+    description = "Collection of modular and reusable compiler and toolchain technologies - Mono build";
+    homepage    = "http://llvm.org/";
+    license     = lib.licenses.bsd3;
+    maintainers = with lib.maintainers; [ thoughtpolice ];
+    platforms   = lib.platforms.all;
+  };
+}