[MacPorts] #62986: mosh 1.3.2_16+perl5_28: Build fails on MacOS X 10.10

[MacPorts]

#62986: mosh 1.3.2_16+perl5_28: Build fails on MacOS X 10.10
----------------------+--------------------
 Reporter:  530f6caa  |      Owner:  (none)
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:  2.7.0
 Keywords:  haspatch  |       Port:  mosh
----------------------+--------------------
 This port fails to build on MacOS X 10.10 due to {{{error: constexpr
 constructor never produces a constant expression [-Winvalid-constexpr]}}}.
 Blacklisting {{{clang < 900}}} allows the port to build.

 See: #62158

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Ticket URL: <https://trac.macports.org/ticket/62986>
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