[MacPorts] #65844: libphonenumber-cpp needs C++14

[MacPorts]

#65844: libphonenumber-cpp needs C++14
------------------------+--------------------------------
 Reporter:  ryandesign  |      Owner:  dbevans
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.7.2
 Keywords:              |       Port:  libphonenumber-cpp
------------------------+--------------------------------
 libphonenumber-cpp needs C++14:

 https://build.macports.org/builders/ports-10.8_x86_64-builder/builds/102088/steps
 /install-port/logs/stdio
 {{{
 /opt/local/var/macports/build
 /_opt_bblocal_var_buildworker_ports_build_ports_devel_libphonenumber-cpp
 /libphonenumber-cpp/work/build/_deps/abseil-cpp-
 src/absl/base/policy_checks.h:79:2: error: "C++ versions less than C++14
 are not supported."
 #error "C++ versions less than C++14 are not supported."
 }}}

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Ticket URL: <https://trac.macports.org/ticket/65844>
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