[MacPorts] #35897: Add a buildbot with +universal for all packages

[MacPorts]

#35897: Add a buildbot with +universal for all packages
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 Reporter:  mojca.miklavec.lists@…          |       Owner:  wsiegrist@…        
     Type:  enhancement                     |      Status:  new                
 Priority:  Low                             |   Milestone:                     
Component:  server/hosting                  |     Version:                     
 Keywords:                                  |        Port:                     
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 It would be sooooooo great if packages like qt4-mac and compilers like
 clang-3.2 would be built with +universal along the normal variants.

 I would like to request either:
 * to add a keyword to portfiles to signal to builtbot the desire to build
 a certain package and its dependencies with +universal (useful for
 qt4-mac, developers could add the flag to commonly used ports and those
 that require longest build times)
 * or simply compile all packages with +universal

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Ticket URL: <https://trac.macports.org/ticket/35897>
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