[MacPorts] #53436: port reclaim reports .turd_MacPorts file as unnused distfile

[MacPorts]

#53436: port reclaim reports .turd_MacPorts file as unnused distfile
------------------------+-----------------------------
 Reporter:  neverpanic  |      Owner:
     Type:  defect      |     Status:  new
 Priority:  Low         |  Milestone:  MacPorts Future
Component:  base        |    Version:  2.4.0
 Keywords:              |       Port:
------------------------+-----------------------------
 MacPorts .pkg installers are created using `port pkg MacPorts` from the
 MacPorts port. MacPorts strips empty directories before packaging after
 destroot. We specify `destroot.keepdirs` in the MacPorts port to avoid
 this, but this directive creates `.turd_MacPorts` files to make these
 directories non-empty.

 This also happens for `$prefix/var/macports/distfiles`, which is now
 scanned by `port reclaim` when run. `port reclaim` does not know about the
 `.turd_MacPorts` file, considers it to be an unused distfile and suggests
 deleting it. While not a problem per-se, this is unexpected for users.

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Ticket URL: <https://trac.macports.org/ticket/53436>
MacPorts <https://www.macports.org/>
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