[cedet-semantic] semantic-clang doesn't recognize clang version format on Mac OSX

[Caibin C. <tig...@gm...>]

clang --version show a different format on Mac OSX:

$ clang --version
Apple LLVM version 4.2 (clang-425.0.28) (based on LLVM 3.2svn)
Target: x86_64-apple-darwin12.4.1
Thread model: posix