CiviMail should not "url track" css urls in a link tag

With HTML mailings, CiviMail is trying to replace stylesheet reference urls. For example,

When I put the URL in my HTML code as this:

<LINK REL=StyleSheet HREF="http://mysite.org/sites/all/themes/zen/cctv/layout.css" TYPE="text/css" MEDIA=screen>

it turns it into this when the final email comes out:

<LINK REL=StyleSheet href='http://mysite.org/sites/all/modules/civicrm/extern/url.php?u=188&qid=148' TYPE="text/css" MEDIA=screen>

When running this url as a test: http://mysite.org/sites/all/modules/civicrm/extern/url.php?u=188&qid=148

I do not get the stylsheet back; I get my drupal page not found and the URL turns into this:

http://mysite.org/sites/all/modules/civicrm/extern/HREF=%22http://mysite.org/sites/all/themes/zen/cctv/layout.css%22

Absolute urls work fine with other tags such as img src. It should allow absolute urls for stylesheet refs.