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ARROW-3578: [Release] Resolve all hard and symbolic links in tar.gz

They may cause some problems when we extract the archive on Windows
and we run RAT against the archive.

Author: Kouhei Sutou <kou@clear-code.com>

Closes #4028 from kou/fix-rat and squashes the following commits:

d7ab0653 <Kouhei Sutou>  Resolve all hard and symbolic links in tar.gz