Add display-details back to define.json to apply its signature neutral config

src-json/define.json

@@ -107,6 +107,13 @@
 		"signatureNeutral": true,
 		"doc": "Read the contents of a file specified in `--display` from standard input."
 	},
+	{
+		"name": "DisplayDetails",
+		"define": "display-details",
+		"signatureNeutral": true,
+		"doc": "Not used anymore, but still sent by vshaxe.",
+		"deprecated": "This flag is no longer supported in Haxe 5"
+	},
 	{
 		"name": "DllExport",
 		"define": "dll-export",