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/build-support/build-fhs-userenv/default.nix

@@ -0,0 +1,49 @@
+{ callPackage, runCommandLocal, writeScript, stdenv, coreutils }:
+
+let buildFHSEnv = callPackage ./env.nix { }; in
+
+args@{ name, runScript ? "bash", extraInstallCommands ? "", meta ? {}, passthru ? {}, ... }:
+
+let
+  env = buildFHSEnv (removeAttrs args [ "runScript" "extraInstallCommands" "meta" "passthru" ]);
+
+  chrootenv = callPackage ./chrootenv {};
+
+  init = run: writeScript "${name}-init" ''
+    #! ${stdenv.shell}
+    for i in ${env}/* /host/*; do
+      path="/''${i##*/}"
+      [ -e "$path" ] || ${coreutils}/bin/ln -s "$i" "$path"
+    done
+
+    [ -d "$1" ] && [ -r "$1" ] && cd "$1"
+    shift
+
+    source /etc/profile
+    exec ${run} "$@"
+  '';
+
+in runCommandLocal name {
+  inherit meta;
+
+  passthru = passthru // {
+    env = runCommandLocal "${name}-shell-env" {
+      shellHook = ''
+        exec ${chrootenv}/bin/chrootenv ${init runScript} "$(pwd)"
+      '';
+    } ''
+      echo >&2 ""
+      echo >&2 "*** User chroot 'env' attributes are intended for interactive nix-shell sessions, not for building! ***"
+      echo >&2 ""
+      exit 1
+    '';
+  };
+} ''
+  mkdir -p $out/bin
+  cat <<EOF >$out/bin/${name}
+  #! ${stdenv.shell}
+  exec ${chrootenv}/bin/chrootenv ${init runScript} "\$(pwd)" "\$@"
+  EOF
+  chmod +x $out/bin/${name}
+  ${extraInstallCommands}
+''