gh-92658: Add Hyper-V socket support (GH-92755)

Modules/socketmodule.h

@@ -76,6 +76,15 @@ struct SOCKADDR_BTH_REDEF {
 # else
 typedef int socklen_t;
 # endif /* IPPROTO_IPV6 */
+
+/* Remove ifdef once Py_WINVER >= 0x0604
+ * socket.h only defines AF_HYPERV if _WIN32_WINNT is at that level or higher
+ * so for now it's just manually defined.
+ */
+# ifndef AF_HYPERV
+#  define AF_HYPERV 34
+# endif
+# include <hvsocket.h>
 #endif /* MS_WINDOWS */
 
 #ifdef HAVE_SYS_UN_H
@@ -288,6 +297,9 @@ typedef union sock_addr {
 #ifdef HAVE_LINUX_TIPC_H
     struct sockaddr_tipc tipc;
 #endif
+#ifdef AF_HYPERV
+    SOCKADDR_HV hv;
+#endif
 } sock_addr_t;
 
 /* The object holding a socket.  It holds some extra information,