[MacPorts] #31593: msmtp: missing dependency on libidn

[MacPorts]

#31593: msmtp: missing dependency on libidn
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 Reporter:  emanuele.giaquinta@…          |       Owner:  macports-tickets@…                   
     Type:  defect                        |      Status:  new                                  
 Priority:  Normal                        |   Milestone:                                       
Component:  ports                         |     Version:  2.0.3                                
 Keywords:                                |        Port:  msmtp                                
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 msmtp provides optional support for libidn, which is currently enabled
 depending on whether the libidn port is installed. Either add a mandatory
 dependency or provide an idn variant as in the mutt-devel port.

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Ticket URL: <https://trac.macports.org/ticket/31593>
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