Merge pull request #30295 from compnerd/WinSock

WinSDK: further extend the WinSock module

Author: compnerd

stdlib/public/Platform/winsdk.modulemap

@@ -15,6 +15,7 @@ module WinSDK [system] [extern_c] {
     header "WinSock2.h"
     header "WS2tcpip.h"
     header "MSWSock.h"
+    header "../shared/afunix.h"
     export *
 
     link "WS2_32.Lib"