TableGen && OpenBSD

Hi, Chris

Laurence, please try a build with this patch in it, hopefully you will
have more luck:
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20080623/064290.html

I tried to reproduce bug on Laurence's OpenBSD box but failed (after
this commit), so I think problem is now fixed. Thanks, Chris!