[MacPorts] #33762: glw: make it a subport of the mesa port

[MacPorts]

#33762: glw: make it a subport of the mesa port
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 Reporter:  ryandesign@…             |       Owner:  css@…           
     Type:  enhancement              |      Status:  new             
 Priority:  Normal                   |   Milestone:                  
Component:  ports                    |     Version:  2.0.4           
 Keywords:                           |        Port:  glw, mesa       
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Comment(by ryandesign@…):

 According to Mesa's faq.html, GLw is now a separate project at
 http://cgit.freedesktop.org/mesa/glw . That's just the repository however;
 I'm not sure where downloads are located.

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Ticket URL: <https://trac.macports.org/ticket/33762#comment:2>
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