[MacPorts] #40986: squid3 does not build on 10.9

[MacPorts]

#40986: squid3 does not build on 10.9
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  Reporter:  simonblanchard@…  |      Owner:  jmr@…
      Type:  defect            |     Status:  new
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:  2.2.1
Resolution:                    |   Keywords:  mavericks
      Port:  squid3            |
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Comment (by jmr@…):

 So apparently they define a sprintf macro in compat/unsafe.h which
 deliberately expands to something invalid, presumably to stop themselves
 from using sprintf in their code. Having sprintf defined as a macro is
 also modifying the system headers included after its definition, with
 predictably bad results.

 Try the attached patch as a workaround.

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Ticket URL: <https://trac.macports.org/ticket/40986#comment:2>
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