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fix: use readlink before realpath for macOS timezone detection

On macOS, os.path.realpath("/etc/localtime") resolves to
/usr/share/zoneinfo.default/... where the /zoneinfo/ marker
doesn't match. os.readlink returns the direct symlink target
/var/db/timezone/zoneinfo/... where it does. Try readlink first,
fall back to realpath for Linux distros where /etc/localtime may
not be a symlink.