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acl_extended_fd(3) on Linux

The text 56c193135d69, as Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze) shipped it.

test for information in the ACL by file descriptor

acl_extended_fd(3) on Linux now