update VPN related kernel headers to 2.6.39.

The original files are updated in I84220a16b667082f4ff75e72c6b0f2f0dddb65df.

Change-Id: I14ca73b79c66427fd2ad58fb54a5ac649c9b7eee
diff --git a/libc/kernel/common/linux/if_pppolac.h b/libc/kernel/common/linux/if_pppolac.h
index bf6eba0..ad212e7 100644
--- a/libc/kernel/common/linux/if_pppolac.h
+++ b/libc/kernel/common/linux/if_pppolac.h
@@ -7,23 +7,28 @@
  ***   structures, and macros generated from the original header, and thus,
  ***   contains no copyrightable information.
  ***
+ ***   To edit the content of this header, modify the corresponding
+ ***   source file (e.g. under external/kernel-headers/original/) then
+ ***   run bionic/libc/kernel/tools/update_all.py
+ ***
+ ***   Any manual change here will be lost the next time this script will
+ ***   be run. You've been warned!
+ ***
  ****************************************************************************
  ****************************************************************************/
 #ifndef __LINUX_IF_PPPOLAC_H
 #define __LINUX_IF_PPPOLAC_H
-
 #include <linux/socket.h>
 #include <linux/types.h>
-
-#define PX_PROTO_OLAC 2
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 struct sockaddr_pppolac {
  sa_family_t sa_family;
  unsigned int sa_protocol;
  int udp_socket;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
  struct __attribute__((packed)) {
  __u16 tunnel, session;
  } local, remote;
 } __attribute__((packed));
-
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif