[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        |
----------------------------+----------------------
Changes (by gaming-hacker):

 * Attachment "Portfile" added.

 cargo portfile

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