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/clang-tools/default.nix

@@ -0,0 +1,39 @@
+{ lib, stdenv, llvmPackages }:
+
+let
+  unwrapped = llvmPackages.clang-unwrapped;
+
+in stdenv.mkDerivation {
+  pname = "clang-tools";
+  version = lib.getVersion unwrapped;
+
+  dontUnpack = true;
+
+  clang = llvmPackages.clang;
+  inherit unwrapped;
+
+  installPhase = ''
+    runHook preInstall
+
+    mkdir -p $out/bin
+
+    substituteAll ${./wrapper} $out/bin/clangd
+    chmod +x $out/bin/clangd
+    for tool in \
+      clang-apply-replacements \
+      clang-check \
+      clang-format \
+      clang-rename \
+      clang-tidy
+    do
+      ln -s $out/bin/clangd $out/bin/$tool
+    done
+
+    runHook postInstall
+  '';
+
+  meta = unwrapped.meta // {
+    description = "Standalone command line tools for C++ development";
+    maintainers = with lib.maintainers; [ patryk27 ];
+  };
+}

pkgs/development/tools/clang-tools/wrapper

@@ -0,0 +1,27 @@
+#!/bin/sh
+
+buildcpath() {
+  local path after
+  while (( $# )); do
+    case $1 in
+        -isystem)
+            shift
+            path=$path${path:+':'}$1
+            ;;
+        -idirafter)
+            shift
+            after=$after${after:+':'}$1
+            ;;
+    esac
+    shift
+  done
+  echo $path${after:+':'}$after
+}
+
+export CPATH=${CPATH}${CPATH:+':'}$(buildcpath ${NIX_CFLAGS_COMPILE} \
+                                               $(<@clang@/nix-support/libc-cflags)):@clang@/resource-root/include
+export CPLUS_INCLUDE_PATH=${CPLUS_INCLUDE_PATH}${CPLUS_INCLUDE_PATH:+':'}$(buildcpath ${NIX_CFLAGS_COMPILE} \
+                                                                                      $(<@clang@/nix-support/libcxx-cxxflags) \
+                                                                                      $(<@clang@/nix-support/libc-cflags)):@clang@/resource-root/include
+
+exec -a "$0" @unwrapped@/bin/$(basename $0) "$@"