[MacPorts] #59071: Coreutils fails to build with XCode 11 on 10.15

[MacPorts]

#59071: Coreutils fails to build with XCode 11 on 10.15
------------------------+----------------------
  Reporter:  markemer   |      Owner:  yan12125
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.6.99
Resolution:             |   Keywords:
      Port:  coreutils  |
------------------------+----------------------

Comment (by kencu):

 These guys <https://gitmemory.com/issue/fink/fink/197/531629669> say to
 set this interesting flag:
 {{{
 -DFTELLO_BROKEN_AFTER_SWITCHING_FROM_READ_TO_WRITE=1
 }}}
 and Google dishes up 254 similar instances on 0.48s :>

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Ticket URL: <https://trac.macports.org/ticket/59071#comment:3>
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