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

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

Change-Id: Ib0b8f5d7c5013b91eae6bbc3847852eb355c7714

libc/arch-x86_64/syscalls/__accept.S

@@ -1,17 +0,0 @@
-/* Generated by gensyscalls.py. Do not edit. */
-
-#include <private/bionic_asm.h>
-
-ENTRY(__accept)
-    movl    $__NR_accept, %eax
-    syscall
-    cmpq    $-MAX_ERRNO, %rax
-    jb      1f
-    negl    %eax
-    movl    %eax, %edi
-    call    __set_errno
-    orq     $-1, %rax
-1:
-    ret
-END(__accept)
-.hidden __accept

libc/arch-x86_64/syscalls/__accept4.S

@@ -2,7 +2,7 @@
 
 #include <private/bionic_asm.h>
 
-ENTRY(accept4)
+ENTRY(__accept4)
     movq    %rcx, %r10
     movl    $__NR_accept4, %eax
     syscall
@@ -14,4 +14,5 @@ ENTRY(accept4)
     orq     $-1, %rax
 1:
     ret
-END(accept4)
+END(__accept4)
+.hidden __accept4

libc/arch-x86_64/syscalls/__socket.S

@@ -2,7 +2,7 @@
 
 #include <private/bionic_asm.h>
 
-ENTRY(socket)
+ENTRY(__socket)
     movl    $__NR_socket, %eax
     syscall
     cmpq    $-MAX_ERRNO, %rax
@@ -13,4 +13,5 @@ ENTRY(socket)
     orq     $-1, %rax
 1:
     ret
-END(socket)
+END(__socket)
+.hidden __socket