message: [build] MSVC: set HAVE_SYSTEM for desktop apps
diff: /* Define for large files, on AIX-style hosts. */
  /* #undef _LARGE_FILES */
  +/* Windows Universal Platform constraints */
  +#if !defined(WINAPI_FAMILY) || (WINAPI_FAMILY == WINAPI_FAMILY_DESKTOP_APP)
  +/* Either a desktop application without API restrictions, or and older system
  + before these macros were defined. */
  +
  +/* ::wsystem is available */
  +#define HAVE_SYSTEM 1
  +
  +#endif // !WINAPI_FAMILY || WINAPI_FAMILY_DESKTOP_APP
  +
  #endif //BITCOIN_BITCOIN_CONFIG_H
  