[LLVMdev] New llvm-gcc4 snapshot

[Chris Lattner]

This changes the build to use llvm-config to figure out which llvm 
libraries to link in.  This fixes build problems when libraries change 
from .a's to .o's (like yesterday) or when dependencies between libraries 
change.
http://nondot.org/sabre/2006-06-01-llvm-gcc-4.tar.gz

It also eliminates some warnings, which enables bootstrap, tested on 
Darwin PPC/X86.

-Chris

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