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

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

Change-Id: Ib0b8f5d7c5013b91eae6bbc3847852eb355c7714

libc/arch-mips/syscalls/__accept.S

@@ -1,19 +0,0 @@
-/* Generated by gensyscalls.py. Do not edit. */
-
-#include <private/bionic_asm.h>
-
-ENTRY(__accept)
-    .set noreorder
-    .cpload t9
-    li v0, __NR_accept
-    syscall
-    bnez a3, 1f
-    move a0, v0
-    j ra
-    nop
-1:
-    la t9,__set_errno
-    j t9
-    nop
-    .set reorder
-END(__accept)

libc/arch-mips/syscalls/__accept4.S

@@ -2,7 +2,7 @@
 
 #include <private/bionic_asm.h>
 
-ENTRY(accept4)
+ENTRY(__accept4)
     .set noreorder
     .cpload t9
     li v0, __NR_accept4
@@ -16,4 +16,4 @@ ENTRY(accept4)
     j t9
     nop
     .set reorder
-END(accept4)
+END(__accept4)

libc/arch-mips/syscalls/__socket.S

@@ -2,7 +2,7 @@
 
 #include <private/bionic_asm.h>
 
-ENTRY(socket)
+ENTRY(__socket)
     .set noreorder
     .cpload t9
     li v0, __NR_socket
@@ -16,4 +16,4 @@ ENTRY(socket)
     j t9
     nop
     .set reorder
-END(socket)
+END(__socket)