add support for clang-tidy on windows

[stixx200]

I want to run clang-tidy on windows on a project, based on rapidjson.

On windows, clang-tidy uses the clang-cl interface. Therefore, the following defines are set / unset:

• __clang__ (set)
• _MSC_VER (set)
• _LIBCPP_VERSION (unset)
• __GLIBCXX__ (unset)

This combination of defines is not supported by rapidjson yet. (rapidjson.h, section "C++11 features". I hotfixed this issue by defining the RAPIDJSON_HAS_CXX11_RVALUE_REFS before including rapidjson:

#ifndef RAPIDJSON_HAS_CXX11_RVALUE_REFS
#if (defined(__clang__) && defined(_MSC_VER) && _MSC_VER >= 1600)
#define RAPIDJSON_HAS_CXX11_RVALUE_REFS 1
#endif
#endif // RAPIDJSON_HAS_CXX11_RVALUE_REFS

[stixx200]

Any update?