Martin Afanasjew d4f5f0cec7 brew.sh: rename 'chdir' to 'safe_cd'
This is inspired by `safe_system` with basically the same implication
(fail on error), making the name a lot less confusing and avoiding a
clash with the `chdir` function previously defined in `bin/brew`.

Closes #414.

Signed-off-by: Martin Afanasjew <martin@afanasjew.de>
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