Spark Theme has dependency on SparkSkin which is not in RSL

Steps to reproduce:
1. Compile a helloworld app like the following with RSLs and generate a link-report

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx"
applicationComplete="lbl.text = getTimer().toString(); mem.text = System.totalMemory.toString()" >

<fx:Script>
<![CDATA[
]]
>
</fx:Script>

<s:Label id="lbl" />
<s:Label y="30" id="mem" />

</s:Application>

2. Examine link report and SWF size
3.

Actual Results: Link report shows that SparkSkin is in the SWF and the SWF size is larger than expected

Expected Results: No SparkSkin in the SWF, smaller SWF.

Workaround (if any):