Fix fields (use of this in static function)

std/Reflect.hx

@@ -272,7 +272,7 @@ class Reflect {
 			var a = __keys__(o);
 			var i = 0;
 			while( i < a.length ) {
-				if( !this.hasOwnProperty.call(o,a[i]) )
+				if( !a.hasOwnProperty.call(o,a[i]) )
 					a.splice(i,1);
 				else
 					++i;