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ARROW-6688: [Packaging] Include s3 support in the conda packages

depends on #5423

Closes #5484 from kszucs/s3-conda and squashes the following commits:

7a3c67c81 <Krisztián Szűcs> test s3fs import
ff6eb22fa <Krisztián Szűcs> Include s3 support in the conda packages

Authored-by: Krisztián Szűcs <szucs.krisztian@gmail.com>
Signed-off-by: Wes McKinney <wesm+git@apache.org>