[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:
Resolution:               |   Keywords:
      Port:  silo         |
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Comment (by kurtjaeke@…):

 The source code looks like silo uses only the HDF5 API to detect the
 compression ('''src/hdf5_drv/silo_hdf5.c''', lines 3112 and following), so
 the dependency on szip can go away.

 I'll attach a new patch.

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Ticket URL: <https://trac.macports.org/ticket/38317#comment:3>
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