[MacPorts] #70450: liburcu is identical to already existing userspace-rcu

[MacPorts]

#70450: liburcu is identical to already existing userspace-rcu
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  Reporter:  barracuda156            |      Owner:  danielluke
      Type:  defect                  |     Status:  assigned
  Priority:  Normal                  |  Milestone:
 Component:  ports                   |    Version:  2.9.3
Resolution:                          |   Keywords:
      Port:  liburcu, userspace-rcu  |
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Comment (by danielluke):

 We should switch to the existing port (and maybe also make a patch for it
 to make it more discoverable).

 I’ll try to test out how we do this in a minimally disruptive way
 (probably need to mark the new port as replaced by the old one).

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Ticket URL: <https://trac.macports.org/ticket/70450#comment:3>
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