[MacPorts] #62440: perl5: invalid SDK path hardcoded on macOS 11

[MacPorts]

#62440: perl5: invalid SDK path hardcoded on macOS 11
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  Reporter:  chrstphrchvz  |      Owner:  mojca
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:
      Port:  perl5         |
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Comment (by jmroot):

 This is almost another aspect of the same underlying issue as #50894 and
 #59786.

 We shouldn't hardcode any SDK path in Config_heavy.pl, we should delete
 the -isysroot and -Wl,-syslibroot flags entirely. That way any SDK
 specified in the environment or CFLAGS will be used, and if none is
 specified, the toolchain falls back to using MacOSX.sdk anyway.

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Ticket URL: <https://trac.macports.org/ticket/62440#comment:1>
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