[MacPorts] #70906: error: use of undeclared identifier 'CLONE_NOOWNERCOPY'

[MacPorts]

#70906: error: use of undeclared identifier 'CLONE_NOOWNERCOPY'
------------------------+--------------------
 Reporter:  ryandesign  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  base        |    Version:  2.10.1
 Keywords:              |       Port:
------------------------+--------------------
 MacPorts base fails to build on macOS 10.12 only:

 https://build.macports.org/builders/base-10.12_x86_64/builds/1373/steps/make%20-C%20vendor/logs/stdio

 {{{
 /opt/bblocal/var/buildworker/base/build/vendor/tcl/unix/tclUnixFCmd.c:567:44:
 error: use of undeclared identifier 'CLONE_NOOWNERCOPY'
     if (clonefile(src, dst, CLONE_NOFOLLOW|CLONE_NOOWNERCOPY) == 0) {
                                            ^
 1 error generated.
 }}}

 See #61349 for how this problem was fixed in ccache.

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Ticket URL: <https://trac.macports.org/ticket/70906>
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