[MacPorts] #31382: hdf5-18: Add license info; move szip into variant

[MacPorts]

#31382: hdf5-18: Add license info; move szip into variant
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 Reporter:  eborisch@…             |       Owner:  mmoll@…           
     Type:  defect                 |      Status:  new               
 Priority:  Normal                 |   Milestone:                    
Component:  ports                  |     Version:  2.0.3             
 Keywords:                         |        Port:  hdf5-18           
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 Add license info to hdf5-18... Dependency szip can have a non-commercial
 license; move it into a variant and update the license information when
 selected.

 Suggested Portfile patch attached.

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Ticket URL: <https://trac.macports.org/ticket/31382>
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