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/accept.cpp b/libc/bionic/accept.cpp
index 8073234..7f7aa06 100644
--- a/libc/bionic/accept.cpp
+++ b/libc/bionic/accept.cpp
@@ -14,10 +14,8 @@
  * limitations under the License.
  */
 
-#include "private/NetdClientDispatch.h"
-
 #include <sys/socket.h>
 
 int accept(int sockfd, sockaddr* addr, socklen_t* addrlen) {
-    return __netdClientDispatch.accept(sockfd, addr, addrlen);
+    return accept4(sockfd, addr, addrlen, 0);
 }