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/bionic/NetdClientDispatch.cpp b/libc/bionic/NetdClientDispatch.cpp
index 17bbd9d..67fa197 100644
--- a/libc/bionic/NetdClientDispatch.cpp
+++ b/libc/bionic/NetdClientDispatch.cpp
@@ -22,8 +22,9 @@
 #define __socketcall
 #endif
 
-extern "C" __socketcall int __accept(int, sockaddr*, socklen_t*);
+extern "C" __socketcall int __accept4(int, sockaddr*, socklen_t*, int);
 extern "C" __socketcall int __connect(int, const sockaddr*, socklen_t);
+extern "C" __socketcall int __socket(int, int, int);
 
 static unsigned fallBackNetIdForResolv(unsigned netId) {
     return netId;
@@ -32,7 +33,8 @@
 // This structure is modified only at startup (when libc.so is loaded) and never
 // afterwards, so it's okay that it's read later at runtime without a lock.
 __LIBC_HIDDEN__ NetdClientDispatch __netdClientDispatch __attribute__((aligned(32))) = {
-    __accept,
+    __accept4,
     __connect,
+    __socket,
     fallBackNetIdForResolv,
 };