[MacPorts] #59224: gcc8 @8.3.0_4: build broken on Catalina or Mojave against 10.15 SDK due to unrecognized header macro __OSX_AVAILABLE_STARTING

[MacPorts]

#59224: gcc8 @8.3.0_4: build broken on Catalina or Mojave against 10.15 SDK due to
unrecognized header macro __OSX_AVAILABLE_STARTING
--------------------------+------------------------------------
  Reporter:  MaddTheSane  |      Owner:  Chris Jones <jonesc@…>
      Type:  defect       |     Status:  closed
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.6.1
Resolution:  fixed        |   Keywords:  catalina
      Port:  gcc8         |
--------------------------+------------------------------------
Changes (by Chris Jones <jonesc@…>):

 * status:  new => closed
 * owner:  (none) => Chris Jones <jonesc@…>
 * resolution:   => fixed


Comment:

 In [changeset:"481909f1dfa28ec7cad2510d3f9827bd65132d9d/macports-ports"
 481909f1dfa28ec7cad2510d3f9827bd65132d9d/macports-ports] (master):
 {{{
 #!ConfigurableCommitTicketReference repository="macports-ports"
 revision="481909f1dfa28ec7cad2510d3f9827bd65132d9d"
 gcc{5,6,7,8}: Add pre-fetch check for Darwin19+
 Closes: https://trac.macports.org/ticket/59351
 Closes: https://trac.macports.org/ticket/59224
 }}}

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Ticket URL: <https://trac.macports.org/ticket/59224#comment:8>
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