[MacPorts] #40422: qt4-mac: update compiler blacklist

[MacPorts]

#40422: qt4-mac: update compiler blacklist
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  Reporter:  macports@…  |      Owner:  macports-tickets@…
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.2.0
Resolution:              |   Keywords:  haspatch
      Port:  qt4-mac     |
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Comment (by macports@…):

 Fair point, although I really doubt anyone is still using GCC 3. So I
 guess the blacklist atom should read {{{{*gcc <= 4.0}}}}?

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Ticket URL: <https://trac.macports.org/ticket/40422#comment:2>
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