[MacPorts] #56451: librsvg:: not big endian, needs port:cargo added in depends_lib

[MacPorts]

#56451: librsvg:: not big endian, needs port:cargo added in depends_lib
----------------------------+----------------------
  Reporter:  gaming-hacker  |      Owner:  dbevans
      Type:  defect         |     Status:  assigned
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.4.3
Resolution:                 |   Keywords:
      Port:  librsvg        |
----------------------------+----------------------

Comment (by gaming-hacker):

 @ryandesign  Unfortunately, I hacked a solution to get it to work and
 moved on, I seem to recall having to hack cargo and rust to get it to
 work. I can attach my portfiles which work for osx 10.12, xcode 9.2, gcc8,
 clang6

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Ticket URL: <https://trac.macports.org/ticket/56451#comment:7>
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