Adam Vandenberg 2dbc6b977f Use same LLVM binary to check build # as we do to build with.
Different llvm binaries were used to check build numbers and to compile with.
Normalize this, and normalize the variable name used to hold the xcode location.
(Calling it "prefix" is confusing, since there are already concepts in Homebrew
called "prefx".)
2010-06-16 13:32:09 -07:00
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