Auto detect NTDDI_VERSION whether need enable COMPAT_GAI

Author: halx99

yasio/config.hpp

@@ -87,12 +87,6 @@ SOFTWARE.
 */
 // #define YASIO_ENABLE_UDS 1
 
-/*
-** Uncomment or add compiler flag -DYASIO_NT_COMPAT_GAI for compatible with Windows XP
-** see: https://docs.microsoft.com/en-us/windows/win32/api/ws2tcpip/nf-ws2tcpip-getaddrinfo
-*/
-// #define YASIO_NT_COMPAT_GAI 1
-
 /*
 ** Uncomment or add compiler flag -DYASIO_NT_XHRES_TIMER to forcing use undocumented NT API to setup high-resolution timer
 */

yasio/impl/socket.hpp

@@ -47,7 +47,7 @@ SOFTWARE.
 #  include <Mswsock.h>
 #  include <Mstcpip.h>
 #  include <Ws2tcpip.h>
-#  if defined(YASIO_NT_COMPAT_GAI)
+#  if NTDDI_VERSION < NTDDI_VISTA
 #    include <Wspiapi.h>
 #  endif
 #  if YASIO__HAS_UDS