[MacPorts] #51733: sbcl: update to 1.3.6 and fix build on Xcode 8

[MacPorts]

#51733: sbcl: update to 1.3.6 and fix build on Xcode 8
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  Reporter:  howarth.at.macports@…  |      Owner:  easieste@…
      Type:  update                 |     Status:  new
  Priority:  Normal                 |  Milestone:
 Component:  ports                  |    Version:  2.3.4
Resolution:                         |   Keywords:  haspatch
      Port:  sbcl                   |
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Comment (by ryandesign@…):

 There's also probably no need to check whether xcodeversion exists.
 MacPorts base will ensure that it does exist.

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Ticket URL: <https://trac.macports.org/ticket/51733#comment:2>
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