[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:  enhancement            |      Status:  new               
 Priority:  Normal                 |   Milestone:                    
Component:  ports                  |     Version:                    
 Keywords:  haspatch               |        Port:  hdf5-18           
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Comment(by eborisch@…):

 That should have said "[...] I wanted to split ''off'' szip from the
 default variant."

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Ticket URL: <https://trac.macports.org/ticket/31382#comment:5>
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