Comment out the dependency on Sybase

I switched from Module::Install back to EU::MM simply because working
with M::I out of the /efs/dist namespace was proving to be really
tedious.  EU::MM just works.  However, EU::MM has no means of
specifying the optional dependencies via recommends or suggests.

For now, I'm commenting out the dependency on Sybase, since I'm only
working with MySQL for now.  The long term solution might be to
provide a site-specific override for this dependency, but that would
assume we have more than one site using this code again.  Sadly, that
seems extremely unlikely, given the fact that the entire development
community is typing this commit message.

Talk about a tree falling the woods.....