[MacPorts] #21236: Update msmtp to latest 1.4.18

[MacPorts]

#21236: Update msmtp to latest 1.4.18
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 Reporter:  chenggao@…          |       Owner:  macports-tickets@…                   
     Type:  update              |      Status:  new                                  
 Priority:  Normal              |   Milestone:                                       
Component:  ports               |     Version:  1.8.0                                
 Keywords:                      |        Port:                                       
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 Please see attached patch to Portfile.

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Ticket URL: <http://trac.macports.org/ticket/21236>
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