[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
 Keywords:                |       Port:  liburcu, userspace-rcu
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 As far as I can tell, new `liburcu` port is identical to existing
 `userspace-rcu`, though lacking some needed fixes like C++11 standard.
 What was the reason to introduce it?

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