[MacPorts] #56295: Correctly represent 64-bit platform as x86_64 in ${os.arch} and pre-generated PortIndex

[MacPorts]

#56295: Correctly represent 64-bit platform as x86_64 in ${os.arch} and pre-
generated PortIndex
--------------------------+--------------------
  Reporter:  raimue       |      Owner:  (none)
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:
Resolution:               |   Keywords:
      Port:               |
--------------------------+--------------------
Changes (by raimue):

 * component:  ports => base


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Ticket URL: <https://trac.macports.org/ticket/56295#comment:3>
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