[MacPorts] #56322: rust @1.26.0: buid failed on OS X <= 10.9

[MacPorts]

#56322: rust @1.26.0: buid failed on OS X <= 10.9
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  Reporter:  l2dy    |      Owner:  g5pw
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:  legacy-os
      Port:  rust    |
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Comment (by Chessax):

 Replying to [comment:31 kencu]:
 > perhaps we need to bump this test in the `librsvg` Portfile up to 10.10
 then:

 That's exactly what I did, maybe I'm an outlier but it did "solve" my
 problem(s) (also casually tried updating XCode.app via app store, but it
 just kept spinning, with no error)

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Ticket URL: <https://trac.macports.org/ticket/56322#comment:32>
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