[MacPorts] #32308: Add license

[MacPorts]

#32308: Add license
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 Reporter:  ciserlohn@…             |       Owner:  bfulgham@…           
     Type:  enhancement             |      Status:  new                  
 Priority:  Normal                  |   Milestone:                       
Component:  ports                   |     Version:  2.0.3                
 Keywords:  haspatch                |        Port:  erlang               
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 Adding license information would allow the erlang port and its dependents
 to be binary distributable.

 See #32282 why it is declared as MPL in the portfile rather than the
 Erlang Public License.

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Ticket URL: <https://trac.macports.org/ticket/32308>
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