[MacPorts] #29276: update cmus to 2.4.0

[MacPorts]

#29276: update cmus to 2.4.0
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 Reporter:  devnull.macports@…         |       Owner:  macports-tickets@…                   
     Type:  update                     |      Status:  new                                  
 Priority:  Normal                     |   Milestone:                                       
Component:  ports                      |     Version:  1.9.2                                
 Keywords:  cmus                       |        Port:  cmus                                 
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Comment(by devnull.macports@…):

 Also change CONFIG_XXX=y to CONFIG_XXX=a, to emulate autoconf behavior
 (don't fail if optional dependency isn't found).

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Ticket URL: <https://trac.macports.org/ticket/29276#comment:2>
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