[MacPorts] #59115: libssh2 @1.9.0 fails to build on PPC Mac OS X 10.5.8 because '#pragma GCC diagnostic not allowed inside functions'

[MacPorts]

#59115: libssh2 @1.9.0 fails to build on PPC Mac OS X 10.5.8 because '#pragma GCC
diagnostic not allowed inside functions'
------------------------+---------------------
  Reporter:  ballapete  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:  leopard
      Port:  libssh2    |
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Comment (by ballapete):

 It built with `configure.compiler=macports-gcc-6`.

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Ticket URL: <https://trac.macports.org/ticket/59115#comment:1>
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