Well, it's not a simple recompile to get a universal binary. A typical binary for OSX consists of at least 30 libraries and even more VLC modules. All of them need to be ported to x86-OSX. Thus, it's probably easier at the moment to create a x86-only binary than a universal. This shouldn't be that hard, afaik.
"The DJ", one of our main contributors to the OSX-port, is working on an improvement though.
Anyway, as Dionoea pointed out, we don't have access to x86-OSX at the moment, so we would be glad for any hints.
If you have a bit of time, please have a look at the compile for OSX HOWTO on
this page and tell us whether it works for you or not (this HOWTO should create a x86-only-binary for you). Note that you need to use a recent svn-snapshot or better the current trunk to be able to use the Xcode version provided with OSX-x86. Information how to get this source is available on the same page.