[MacPorts] #34458: netcdf: Remove szip dependency

[MacPorts]

#34458: netcdf: Remove szip dependency
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 Reporter:  eborisch@…             |       Owner:  macports-tickets@…                   
     Type:  enhancement            |      Status:  new                                  
 Priority:  Normal                 |   Milestone:                                       
Component:  ports                  |     Version:  2.1.0                                
 Keywords:                         |        Port:  netcdf                               
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 The szip port is not required by the hdf5-18 port anymore; it was moved
 into the +szip variant as it is not distributable and is not needed for
 the bulk of hdf5's functionality.

 Removing this will make netcdf distributable as well.

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Ticket URL: <https://trac.macports.org/ticket/34458>
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