Make sure $CFG_LLVM_CONFIG is set to $CFG_LLVM_ROOT/bin/llvm-config #1064
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On my machine I have two LLVM builds, one of regular HEAD and one
for Rust in ~/rust-llvm - by default CFG_LLVM_CONFIG is set to
/usr/local/bin/llvm-config which is wrong, because the probe for it
initially happens earlier in configure and succeeds (so putvar is called.)
This causes it to be emitted twice into the Makefile but the second
instance wins.