[MacPorts] #29786: Unselect universal variant if there ends up being only one arch

[MacPorts]

#29786: Unselect universal variant if there ends up being only one arch
-------------------------------------+--------------------------------------
 Reporter:  ryandesign@…             |       Owner:  macports-tickets@…                   
     Type:  enhancement              |      Status:  new                                  
 Priority:  Normal                   |   Milestone:                                       
Component:  base                     |     Version:  1.9.2                                
 Keywords:                           |        Port:                                       
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 If I am on Snow Leopard (default build_arch is x86_64) and have a port
 that limits building to 32-bit ("supported_archs i386 ppc") and I request
 the universal variant, the port will end up installed for only i386. "port
 -v installed" shows the port is installed with only i386 arch, but it
 still shows the universal variant is selected.

 {{{
 $ port -v installed twain-sane
 The following ports are currently installed:
   twain-sane @2.5_1+universal (active) platform='darwin 10' archs='i386'
 }}}

 Suggestion: If the intersection of universal_archs and supported_archs
 leaves only a single arch, MacPorts should unselect the universal variant.

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Ticket URL: <https://trac.macports.org/ticket/29786>
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