Gating network behind compile flag

tools/item.py

@@ -1,6 +1,7 @@
 import argparse
 import json
-import os
+
+from tools.writeifchanged import write_if_changed
 
 parser = argparse.ArgumentParser(description="Item JSON to .h defines")
 parser.add_argument("--json", required=True, help="Path to item JSON file")
@@ -109,6 +110,4 @@ out += [
   "",
 ]
 
-os.makedirs(os.path.dirname(args.output), exist_ok=True)
-with open(args.output, "w", encoding="utf-8") as f:
-  f.write("\n".join(out))
+write_if_changed(args.output, "\n".join(out))