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/pkg-config-wrapper/pkg-config-wrapper.sh

@@ -0,0 +1,23 @@
+#! @shell@
+set -eu -o pipefail +o posix
+shopt -s nullglob
+
+if (( "${NIX_DEBUG:-0}" >= 7 )); then
+    set -x
+fi
+
+source @out@/nix-support/utils.bash
+
+if [ -z "${NIX_PKG_CONFIG_WRAPPER_FLAGS_SET_@suffixSalt@:-}" ]; then
+    source @out@/nix-support/add-flags.sh
+fi
+
+set -- "$@" @addFlags@
+
+if (( ${#role_suffixes[@]} > 0 )); then
+    # replace env var with nix-modified one
+    PKG_CONFIG_PATH=$PKG_CONFIG_PATH_@suffixSalt@ exec @prog@ "$@"
+else
+    # pkg-config isn't a real dependency so ignore setup hook entirely
+    exec @prog@ "$@"
+fi