[MacPorts] #61653: gimp-gap-devel @2.7.0-20191012+quartz fails to build on Catalina

[MacPorts]

#61653: gimp-gap-devel @2.7.0-20191012+quartz fails to build on Catalina
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  Reporter:  p-bro           |      Owner:  dbevans
      Type:  defect          |     Status:  assigned
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:
Resolution:                  |   Keywords:
      Port:  gimp-gap-devel  |
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Comment (by pietvo):

 Adding `configure.cflags-append -Wno-implicit-function-declaration ` to
 Portfile solves this for me (Xcode 12.4 on Catalina).

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Ticket URL: <https://trac.macports.org/ticket/61653#comment:4>
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