message: Update doctest_impl.h
  Fix macros `WIN32_LEAN_AND_MEAN` typo
diff: @@ -554,9 +554,9 @@ extern "C" __declspec(dllimport) int __stdcall IsDebuggerPresent();
  #ifdef DOCTEST_PLATFORM_WINDOWS
  // defines for a leaner windows.h
  -#ifndef WIN32_MEAN_AND_LEAN
  -#define WIN32_MEAN_AND_LEAN
  -#endif // WIN32_MEAN_AND_LEAN
  +#ifndef WIN32_LEAN_AND_MEAN
  +#define WIN32_LEAN_AND_MEAN
  +#endif // WIN32_LEAN_AND_MEAN
  #ifndef VC_EXTRA_LEAN
  #define VC_EXTRA_LEAN
  #endif // VC_EXTRA_LEAN
  