[MacPorts] #55962: rust @1.24.0: universal variant does not build universal

[MacPorts]

#55962: rust @1.24.0: universal variant does not build universal
------------------------+------------------
 Reporter:  ryandesign  |      Owner:  g5pw
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  rust
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 {{{
 $ port -v installed rust
 The following ports are currently installed:
   rust @1.24.0_0+universal (active) platform='darwin 16' archs='i386
 x86_64' date='2018-03-04T23:56:41-0600'
 $ lipo -info /opt/local/bin/rustc
 Non-fat file: /opt/local/bin/rustc is architecture: x86_64
 }}}

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Ticket URL: <https://trac.macports.org/ticket/55962>
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