Dynare++: use C++11 threads (instead of POSIX threads API)
On Windows, this means that a POSIX threads implementation is no longer needed, since C++11 threads are implemented using native Windows threads. On GNU/Linux and macOS, POSIX threads are still used under the hood. A new m4 macro (AX_CXX11_THREAD) is used to add the proper compilation flags (instead of AX_PTHREAD).
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