main/rsync: upgrade to 3.2.7

Commit 530dc333 for 3.16-stable

See also:

• https://github.com/WayneD/rsync/issues/356
• https://github.com/WayneD/rsync/commit/950730313de994d191ba2d5be575e97690b355e8
• https://github.com/WayneD/rsync/commit/71c2b5d0e386b845fb2f4d427568451f098008ff
• https://github.com/WayneD/rsync/commit/464555ea923b32f3504678d05bc7de9205e5c8da
• https://github.com/rpki-client/rpki-client-portable/issues/74