Mark sockets on creation (socket()) and accept4().

Remove the separate syscall for accept() and implement it as accept4(..., 0).

Change-Id: Ib0b8f5d7c5013b91eae6bbc3847852eb355c7714
diff --git a/libc/private/NetdClientDispatch.h b/libc/private/NetdClientDispatch.h
index c256288..8d8947d 100644
--- a/libc/private/NetdClientDispatch.h
+++ b/libc/private/NetdClientDispatch.h
@@ -23,8 +23,9 @@
 __BEGIN_DECLS
 
 struct NetdClientDispatch {
-    int (*accept)(int, struct sockaddr*, socklen_t*);
+    int (*accept4)(int, struct sockaddr*, socklen_t*, int);
     int (*connect)(int, const struct sockaddr*, socklen_t);
+    int (*socket)(int, int, int);
     unsigned (*netIdForResolv)(unsigned);
 };