[MacPorts] #65484: sbcl: add support for PPC

[MacPorts]

#65484: sbcl: add support for PPC
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  Reporter:  acjones8     |      Owner:  KubaO
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.7.2
Resolution:               |   Keywords:  powerpc ppc leopard haspatch
      Port:  sbcl maxima  |
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Changes (by kakuhen):

 * Attachment "Portfile" added.

 Experimental Portfile for building SBCL on PPC

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Ticket URL: <https://trac.macports.org/ticket/65484>
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