vlib: use new filename format

vlib/net/init_windows.c.v

@@ -0,0 +1,37 @@
+module net
+
+#flag -lws2_32
+#include <winsock2.h>
+#include <Ws2tcpip.h>
+
+struct C.WSAData {
+mut:
+	wVersion u16
+	wHighVersion u16	
+	szDescription [257]byte
+	szSystemStatus [129]byte
+	iMaxSockets u16
+	iMaxUdpDg u16
+	lpVendorInfo byteptr
+}
+
+
+const (
+	WSA_V22 = 0x202 // C.MAKEWORD(2, 2)
+)
+
+fn init() {
+	mut wsadata := C.WSAData{}
+	res := C.WSAStartup(WSA_V22, &wsadata)
+	if res != 0 {
+		panic('socket: WSAStartup failed')
+	}
+}
+
+fn error_code() int {
+	return C.WSAGetLastError()
+}
+
+pub const (
+	MSG_NOSIGNAL = 0
+)