[MacPorts] #57109: cquery @20180718 shared_timed_mutex introduced in macOS 10.12

[MacPorts]

#57109: cquery @20180718 shared_timed_mutex introduced in macOS 10.12
--------------------+--------------------
 Reporter:  rurban  |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  cquery
--------------------+--------------------
 cquery-20180718_0.darwin_15 fails to build on darwin 15.6:

 {{{
 cquery-20180718/src/import_manager.h:30:8: error: 'shared_timed_mutex' is
 unavailable: introduced in macOS 10.12
 :info:build   std::shared_timed_mutex dependency_mutex_;
 :info:build        ^
 :info:build
 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/..
 /include/c++/v1/shared_mutex:202:58: note: 'shared_timed_mutex' has been
 explicitly marked unavailable here
 }}}

 needs to be worked around somehow for older darwin's.

-- 
Ticket URL: <https://trac.macports.org/ticket/57109>
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