message: skip dllexport stuff altogether (compiled as a static library)
diff: //#define IM_ASSERT(_EXPR) MyAssert(_EXPR)
  //---- Define attributes of all API symbols declarations, e.g. for DLL under Windows.
  +#if 0
  # ifdef _WIN32
  # ifdef imgui_EXPORTS
  # define IMGUI_API __declspec(dllexport)
  # else
  # define IMGUI_API
  # endif
  +#else
  +# define IMGUI_API
  +#endif
  //---- Include imgui_user.h at the end of imgui.h
  //#define IMGUI_INCLUDE_IMGUI_USER_H
  