[MacPorts] #55783: librsvg @2.42.2 +universal: dependency cargo does not build universal

[MacPorts]

#55783: librsvg @2.42.2 +universal: dependency cargo does not build universal
------------------------+---------------------
 Reporter:  ryandesign  |      Owner:  dbevans
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  librsvg
------------------------+---------------------
 {{{
 $ port -v installed librsvg
 The following ports are currently installed:
   librsvg @2.40.20_0+universal+viewer (active) platform='darwin 16'
 archs='i386 x86_64' date='2017-12-18T23:00:05-0600'
 $ sudo port -u upgrade librsvg
 --->  Computing dependencies for librsvg
 Error: Cannot install librsvg for the archs 'i386 x86_64' because
 Error: its dependency cargo does not build for the required archs by
 default
 Error: and does not have a universal variant.
 Error: Follow https://guide.macports.org/#project.tickets to report a bug.
 $
 }}}

 Would it be sufficient to mark cargo and rust `installs_libs no`? Or do
 they actually install libraries that get embedded into things that are
 built with cargo or rust?

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Ticket URL: <https://trac.macports.org/ticket/55783>
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