[MacPorts] #63785: rspamd @3.1: builds failing for macOS 10.12 and earlier

[MacPorts]

#63785: rspamd @3.1: builds failing for macOS 10.12 and earlier
----------------------+----------------------
  Reporter:  mascguy  |      Owner:  mascguy
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.7.1
Resolution:           |   Keywords:
      Port:  rspamd   |
----------------------+----------------------

Comment (by kencu):

 not the very newest, but newer than 10.13’s libcxx.

 NB, see

 https://github.com/boostorg/wave/issues/84

 https://github.com/boostorg/wave/commit/c9d096b3cc050adb7fa46f4b61f8e16cc3ffc068

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Ticket URL: <https://trac.macports.org/ticket/63785#comment:17>
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