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Includes updates to m4/ax_cxx_compile_stdcxx.m4 to make it work with msvc, which supports C++-11 with no flags but doesn't set __cplusplus to a recent value.
Includes updates to m4/ax_cxx_compile_stdcxx.m4 to make it work with msvc, which supports C++-11 with no flags but doesn't set __cplusplus to a recent value.
