[MacPorts] #60715: knot: depends on userspace-rcu which does not exist

[MacPorts]

#60715: knot: depends on userspace-rcu which does not exist
------------------------+-------------------------
 Reporter:  ryandesign  |      Owner:  Schamschula
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.6.2
 Keywords:              |       Port:  knot
------------------------+-------------------------
 https://build.macports.org/builders/ports-10.15_x86_64-builder/builds/31323/steps
 /install-dependencies/logs/stdio

 {{{
 Error: Dependency 'userspace-rcu' not found.
 Error: mportdepends knot activate failed.
 Calculating dependencies for 'knot' failed, aborting.
 ./mpbb/mpbb: error: `install-dependencies' failed to run successfully
 }}}

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Ticket URL: <https://trac.macports.org/ticket/60715>
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