[MacPorts] #60344: FreeRDP 2.0.0 fails to build on <= 10.13

[MacPorts]

#60344: FreeRDP 2.0.0  fails to build on <= 10.13
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  Reporter:  ra1nb0w  |      Owner:  (none)
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  FreeRDP  |
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Comment (by ryandesign):

 Replying to [ticket:60344 ra1nb0w]:
 > == 10.13
 > {{{
 > Undefined symbols for architecture x86_64:
 >   "_objc_msgSend", referenced from:
 >       _rdpsnd_mac_open in librdpsnd-client-mac.a(rdpsnd_mac.m.o)
 >       _rdpsnd_mac_set_volume in librdpsnd-client-mac.a(rdpsnd_mac.m.o)
 >       _rdpsnd_mac_play in librdpsnd-client-mac.a(rdpsnd_mac.m.o)
 >       _rdpsnd_mac_close in librdpsnd-client-mac.a(rdpsnd_mac.m.o)
 > }}}

 I filed [https://github.com/FreeRDP/FreeRDP/issues/6163 an upstream bug
 report about this]. It works if I use `configure.ldflags-append -framework
 Cocoa` but I don't know why it works on 10.14 and 10.15 without that.

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Ticket URL: <https://trac.macports.org/ticket/60344#comment:3>
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