5773 Extra pointless steps in kernel module builds

I've been using this in illumos-core for some time now.  At one point I measured for my setup an improvment of about 20 minutes in the build time (out of a 2 hour build.)  I think this was an excessive result -- I doubt most people will see a lot here, but hey, every little bit helps.
I also cleaned up a couple of CTF-related build scripts (including one in perl) that is now no longer needed.