Fix cache-break value to be once-per-compile

lime/Assets.hx

@@ -1060,11 +1060,14 @@ class AssetCache {
 		audio = new Map<String, AudioBuffer> ();
 		font = new Map<String, Dynamic /*Font*/> ();
 		image = new Map<String, Image> ();
-		version = Std.int (Math.random () * 1000000);
+		version = AssetCache.cacheVersion ();
 		
 	}
 	
 	
+	private macro static function cacheVersion () {}
+	
+	
 	public function clear (prefix:String = null):Void {
 		
 		if (prefix == null) {
@@ -1504,6 +1507,20 @@ class Assets {
 }
 
 
+class AssetCache {
+	
+	
+	private static macro function cacheVersion () {
+		
+		var version = Std.int (Math.random () * 1000000);
+		return Context.makeExpr (version, Context.currentPos ());
+		
+	}
+	
+	
+}
+
+
 #end
 #end
 
@@ -1518,4 +1535,4 @@ class Assets {
 	var TEMPLATE = "TEMPLATE";
 	var TEXT = "TEXT";
 	
-}
+}