Commit c9f0677c authored by Mike Fleetwood's avatar Mike Fleetwood

Update Autoconf macro AX_CXX_COMPILE_STDCXX_11 to latest serial 18

Update to the latest version of the AX_CXX_COMPILE_STDCXX_11 macro from
the Autoconf Archive,  Note that the macro now depends on
AX_CXX_COMPILE_STDCXX so this macro has to be included too.
parent 73e7367e
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