[MacPorts] #38406: boost: disable no_single by default

[MacPorts]

#38406: boost: disable no_single by default
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  Reporter:  aronnax@…    |      Owner:  macports-tickets@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  boost        |
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Comment (by ryandesign@…):

 Has duplicate #44118.

 Subports might be a good solution. Leave the boost port installing only
 the multithreaded libraries, and make a new boost-st subport to install
 just the singlethreaded libraries.

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Ticket URL: <https://trac.macports.org/ticket/38406#comment:5>
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