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Add a check that tests whether the c++ compiler supports c++11, either by default, by adding the compiler flag -std=c++11, or by adding a compiler flag that the user has specified via the environment variable CXX11_CXXFLAGS. The test only does a very shallow check of c++11 support, i.e. it tests whether the define __cplusplus >= 201103L to confirm language support by the compiler, and it checks whether the header <tuple> is available to test the availability of the c++11 standard library. A make file conditional HAVE_STD_CXX11 is provided that is used in this patch to enable the test in st/mesa if C++11 support is available. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=102665 Acked-by: Emil Velikov <emil.velikov@collabora.com>
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