[MacPorts] #47679: libnifalcon @1.0.2: undefined symbols boost::system::system_category, boost::system::generic_category

[MacPorts]

#47679: libnifalcon @1.0.2: undefined symbols boost::system::system_category,
boost::system::generic_category
--------------------------+-----------------------------
 Reporter:  ryandesign@…  |      Owner:  richardsjohnt@…
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.3.99
 Keywords:  haspatch      |       Port:  libnifalcon
--------------------------+-----------------------------
 libnifalcon @1.0.2 fails to build, citing undefined symbols.

 The attached patch cherry-picks three upstream commits that let the port
 build again.

 It also switches to using `cmake.out_of_source yes`, as had been requested
 in #47197, instead of doing the equivalent manually.

 May I commit it?

-- 
Ticket URL: <https://trac.macports.org/ticket/47679>
MacPorts <https://www.macports.org/>
Ports system for OS X