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>

nixos/modules/installer/tools/nixos-version.sh

@@ -0,0 +1,24 @@
+#! @runtimeShell@
+# shellcheck shell=bash
+
+case "$1" in
+  -h|--help)
+    exec man nixos-version
+    exit 1
+    ;;
+  --hash|--revision)
+    if ! [[ @revision@ =~ ^[0-9a-f]+$ ]]; then
+      echo "$0: Nixpkgs commit hash is unknown"
+      exit 1
+    fi
+    echo "@revision@"
+    ;;
+  --json)
+    cat <<EOF
+@json@
+EOF
+    ;;
+  *)
+    echo "@version@ (@codeName@)"
+    ;;
+esac