[MacPorts] #31517: phonon update to 4.5.0

[MacPorts]

#31517: phonon update to 4.5.0
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 Reporter:  snc@…             |       Owner:  macports-tickets@…                   
     Type:  update            |      Status:  new                                  
 Priority:  Normal            |   Milestone:                                       
Component:  ports             |     Version:                                       
 Keywords:                    |        Port:  phonon                               
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Comment(by nicos@…):

 Here is a suggestion of Portfile for updating phonon to version 4.5.1. It
 greatly simplifies the Portfile, but, as mentioned in the dev mailing
 list, some backends such as qt7 have been suppressed in this version of
 phonon, but other backends are available as independent code in the kde
 repositories, not considered in the suggestion.

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Ticket URL: <https://trac.macports.org/ticket/31517#comment:2>
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