[MacPorts] #38317: silo: upgrade to 4.9

[MacPorts]

#38317: silo: upgrade to 4.9
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 Reporter:  kurtjaeke@…  |      Owner:  macports-tickets@…
     Type:  update       |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.1.3
 Keywords:               |       Port:  silo
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 Please upgrade port silo to version 4.9.

 Changes:
  * when depending on hdf5, also depend on szip
  * '''--disable-qt''' does not exist  anymore, disable browser and silex
 instead (which use Qt)

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Ticket URL: <https://trac.macports.org/ticket/38317>
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