This commit partial reverts beed39e46fa021dd1c133c2c8eaaa81b524e68c7. For users whose local brew is at around 2015-06-02 to 2015-06-11, running `brew update` will emit following error: Error: undefined method 'full_version' for OS::Mac:Module This is caused by the same bug described in Homebrew/homebrew#42553. Let's use `MACOS_FULL_VERSION` for now to restore `brew update` compatibility for these users. TODO: revert this commit after core code and formulae separation.
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