[MacPorts] #52539: sbcl @1.3.10_0 fails building on 10.6.8

[MacPorts]

#52539: sbcl @1.3.10_0 fails building on 10.6.8
-------------------------+-------------------------
  Reporter:  udbraumann  |      Owner:  easye
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.3.4
Resolution:              |   Keywords:  snowleopard
      Port:  sbcl        |
-------------------------+-------------------------

Comment (by kencu):

 This currently is at `1.3.21`, and on the buildbots, built on
 darwin10_i386, and darwin 13+ as x86_64. So the hole is darwin 10 - 12
 x86_64. This is probably to be fixed with the `cxx11 1.1 PortGroup` with
 that distribution of failures.

 Builds fine on 10.6 x86_64 with clang-3.9 and libc++, on my system.

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Ticket URL: <https://trac.macports.org/ticket/52539#comment:4>
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