[MacPorts] #62620: rust portfile uses cp -r

[MacPorts]

#62620: rust portfile uses cp -r
------------------------+----------------------
 Reporter:  ryandesign  |      Owner:  g5pw
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.6.4
 Keywords:              |       Port:  rust
------------------------+----------------------
 The rust portfile uses system to call `cp -r`. The `-r` flag to `cp` is
 obsolete. (See the cp manpage.) Use `-R` instead.

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Ticket URL: <https://trac.macports.org/ticket/62620>
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