Library Project swc file size issue

Steps to reproduce:
1. Create a flex library project, create a component which extends SkinnableComponent and introduce a skin for it with a skinpart.
2. Create manifest for library project and include it in Project Properties
3. It should give following error, mentioning it is not able to find the spark components: e.g.
Could not resolve <s:SolidColor> to a component implementation. TestSkin.mxml rglib/src/com/riageeks/skins/default line 6 Flex Problem

4. Apply the workaround mentioned in http://bugs.adobe.com/jira/browse/FB-19161
It resolved the error, but the swc file size is very big.

Actual Results:
A big swc file, after exploring the swc, the catalog.xml file has entries for all the classes.

Expected Results:
A small swc file size, which doesn't have to include all the class name mentioned in the namespace.

Workaround (if any):
Use ant build file and in the compc argument, give location to flex4.swc and other swc files needed in the external-library-path argument. For details look at the attachment.