[MacPorts] #35541: webp: Update to 0.1.99

[MacPorts]

#35541: webp: Update to 0.1.99
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 Reporter:  charlie.clark@…                    |       Owner:  ryandesign@…           
     Type:  update                             |      Status:  assigned               
 Priority:  Normal                             |   Milestone:                         
Component:  ports                              |     Version:  2.1.2                  
 Keywords:  haspatch                           |        Port:  webp                   
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Comment(by charlie.clark@…):

 I know we use source distfiles but I noticed that the builds were for <
 10.7, which seems to work with the patch.

 Everything seems to work fine. My biggest gripe would be having `cwebp`
 and `dwebp` but no `webp -c` or `webp -d` aliases. But I guess that's for
 upstream.

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Ticket URL: <https://trac.macports.org/ticket/35541#comment:2>
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