[MacPorts] #13960: improvements to libsdl_sound port

[MacPorts]

#13960: improvements to libsdl_sound port
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 Reporter:  tow at uszla.me.uk  |       Owner:  macports-tickets at lists.macosforge.org
     Type:  defect           |      Status:  new                                  
 Priority:  Normal           |   Milestone:                                       
Component:  ports            |     Version:  1.6.0                                
 Keywords:                   |  
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 The libsdl_sound port was less than optimal; it didn't use several
 libraries that it could (flac, speex, physfs).

 I've updated the Portfile to reflect this. This also entailed some patches
 to the source. (all previous patches are no longer necessary.)

 These are all attached below.

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Ticket URL: <http://trac.macosforge.org/projects/macports/ticket/13960>
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