[MacPorts] #18456: Add missing port:p5-digest-hmac dependency

[MacPorts]

#18456: Add missing port:p5-digest-hmac dependency
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 Reporter:  brad@…            |       Owner:  macports-tickets@…                   
     Type:  defect            |      Status:  new                                  
 Priority:  Normal            |   Milestone:  Port Bugs                            
Component:  ports             |     Version:  1.7.0                                
 Keywords:  imapsync          |        Port:  imapsync                             
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 imapsync failed to configure on my system without this perl module.

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Ticket URL: <http://trac.macports.org/ticket/18456>
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