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/remove-references-to/darwin-sign-fixup.sh

@@ -0,0 +1,5 @@
+# Fixup hook for nukeReferences, not stdenv
+
+source @signingUtils@
+
+fixupHooks+=(signIfRequired)

pkgs/build-support/remove-references-to/default.nix

@@ -0,0 +1,35 @@
+# The program `remove-references-to' created by this derivation replaces all
+# references to the given Nix store paths in the specified files by a
+# non-existent path (/nix/store/eeee...).  This is useful for getting rid of
+# dependencies that you know are not actually needed at runtime.
+
+{ lib, stdenvNoCC, signingUtils, shell ? stdenvNoCC.shell }:
+
+let
+  stdenv = stdenvNoCC;
+
+  darwinCodeSign = stdenv.targetPlatform.isDarwin && stdenv.targetPlatform.isAarch64;
+in
+
+stdenv.mkDerivation {
+  name = "remove-references-to";
+
+  dontUnpack = true;
+  dontConfigure = true;
+  dontBuild = true;
+
+  installPhase = ''
+    mkdir -p $out/bin
+    substituteAll ${./remove-references-to.sh} $out/bin/remove-references-to
+    chmod a+x $out/bin/remove-references-to
+  '';
+
+  postFixup = lib.optionalString darwinCodeSign ''
+    mkdir -p $out/nix-support
+    substituteAll ${./darwin-sign-fixup.sh} $out/nix-support/setup-hooks.sh
+  '';
+
+  inherit (builtins) storeDir;
+  shell = lib.getBin shell + (shell.shellPath or "");
+  signingUtils = if darwinCodeSign then signingUtils else null;
+}

pkgs/build-support/remove-references-to/remove-references-to.sh

@@ -0,0 +1,37 @@
+#! @shell@ -e
+
+fixupHooks=()
+
+if [ -e @out@/nix-support/setup-hooks.sh ]; then
+    source @out@/nix-support/setup-hooks.sh
+fi
+
+# References to remove
+targets=()
+while getopts t: o; do
+    case "$o" in
+        t) storeId=$(echo "$OPTARG" | sed -n "s|^@storeDir@/\\([a-z0-9]\{32\}\\)-.*|\1|p")
+           if [ -z "$storeId" ]; then
+               echo "-t argument must be a Nix store path"
+               exit 1
+           fi
+           targets+=("$storeId")
+    esac
+done
+shift $(($OPTIND-1))
+
+# Files to remove the references from
+regions=()
+for i in "$@"; do
+    test ! -L "$i" -a -f "$i" && regions+=("$i")
+done
+
+for target in "${targets[@]}" ; do
+    sed -i -e "s|@storeDir@/$target-|@storeDir@/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-|g" "${regions[@]}"
+done
+
+for region in "${regions[@]}"; do
+    for hook in "${fixupHooks[@]}"; do
+        eval "$hook" "$i"
+    done
+done