[MacPorts] #62164: qemu @5.2.0: build failure with +cocoa

[MacPorts]

#62164: qemu @5.2.0: build failure with +cocoa
---------------------+-----------------------
  Reporter:  Ionic   |      Owner:  raimue
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:  legacy-os
      Port:  qemu    |
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Comment (by kencu):

 I don't immediately see the problem.

 The availability stuff, I'm sure you know, looks like
 [https://clang.llvm.org/docs/LanguageExtensions.html#objective-c-available
 this] now:
 {{{
 void my_function(NSSomeClass* var) {
   if (@available(macOS 10.12, *)) {
     [var fancyNewMethod];
   } else {
     // Put fallback behavior for old macOS versions (and for non-mac
     // platforms) here.
   }
 }}}}

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Ticket URL: <https://trac.macports.org/ticket/62164#comment:8>
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