[MacPorts] #63618: watchman @2021.09.20.00_0: Fails to build if MacOS version < 10.14

[MacPorts]

#63618: watchman @2021.09.20.00_0: Fails to build if MacOS version < 10.14
---------------------+----------------------
 Reporter:  rbubley  |      Owner:  danchr@…
     Type:  defect   |     Status:  assigned
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:
 Keywords:           |       Port:  watchman
---------------------+----------------------
 Build fails on MacOS 10.13.6, with the key line being:


 {{{
 :info:build
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_sysutils_watchman/watchman/work/watchman-2021.09.20.00/watchman/ProcessLock.cpp:26:20:
 error: call to unavailable function 'get': introduced in macOS 10.14
 }}}

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Ticket URL: <https://trac.macports.org/ticket/63618>
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