Update Files

Kha/Tools/linux_x64/std/eval/luv/Once.hx

@@ -0,0 +1,18 @@
+package eval.luv;
+
+/**
+	Once-only initialization.
+
+	@see https://aantron.github.io/luv/luv/Luv/Once
+**/
+@:coreType abstract Once {
+	/**
+		Allocates and initializes a once-only barrier.
+	**/
+	static public function init():Result<Once>;
+
+	/**
+		Guards the given callback to be called only once.
+	**/
+	public function once(callback:()->Void):Void;
+}