[MacPorts] #57749: dart-sdk @2.0.0: update to 2.1.0

[MacPorts]

#57749: dart-sdk @2.0.0: update to 2.1.0
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  Reporter:  AlexAkhremenko  |      Owner:  (none)
      Type:  update          |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:
Resolution:                  |   Keywords:
      Port:  dart-sdk        |
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Changes (by AlexAkhremenko):

 * Attachment "Portfile-rrdtool.diff" added.

 dart-sdk update to @2.1.0

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Ticket URL: <https://trac.macports.org/ticket/57749>
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