[MacPorts] #50770: In rsync_options, use --delete-delay instead of --delete-after

[MacPorts]

#50770: In rsync_options, use --delete-delay instead of --delete-after
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 Reporter:  ryandesign@…  |      Owner:  macports-tickets@…
     Type:  enhancement   |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  base          |    Version:  2.3.4
 Keywords:                |       Port:
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 MacPorts base currently sets `rsync_options "-rtzv --delete-after"` in
 ./src/macports1.0/macports.tcl. `--delete-delay` is more efficient than
 `--delete-after`. We should test if the version of rsync in all versions
 of OS X MacPorts runs on supports using `--delete-delay`, and if so, use
 this instead.

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Ticket URL: <https://trac.macports.org/ticket/50770>
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