[MacPorts] #31185: ffmpeg: Replace negatively named variants with positively named and changing default variants

[MacPorts]

#31185: ffmpeg: Replace negatively named variants with positively named and
changing default variants
------------------------------+---------------------------------------------
 Reporter:  cal@…             |       Owner:  devans@…           
     Type:  defect            |      Status:  new                
 Priority:  Low               |   Milestone:                     
Component:  ports             |     Version:  2.0.99             
 Keywords:  haspatch          |        Port:  ffmpeg             
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 The state of ffmepg's variants is less than optimal… if you want AAC
 support you will install `ffmpeg -no_nonfree`. Now while I could think of
 a few ways to add yet another negation, maybe we should change those to
 positively named variants.

 The attached patch changes
  - no_nonfree to nonfree and makes it the default my removing +non_free
 from default_variants
  - no_gpl to gpl and makes it default by adding +gpl to default_variants
  - no_mxx to mmx and makes it default by adding +mmx to default_variants

 Notes: The no_gpl variant deleted a "--enable-libfaad" switch from
 configure.args, which was never there to begin with and breaks the build
 if added. I've commented it at the moment.

 The same patch should probably applied against ffmpeg-devel, and maybe
 gst-ffmpeg, too.

-- 
Ticket URL: <https://trac.macports.org/ticket/31185>
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