Update to kernel headers v4.9.3.

Test: Built arm, arm64, x86, x86_64 targets.
Test: Booted on angler, and ran bionic unit tests (32 bit and 64 bit).

Change-Id: I14a8dcbea11b41f83431eabed6590cd25af07b1d
diff --git a/libc/kernel/uapi/linux/ipv6.h b/libc/kernel/uapi/linux/ipv6.h
index 5a1d4fd..90e6483 100644
--- a/libc/kernel/uapi/linux/ipv6.h
+++ b/libc/kernel/uapi/linux/ipv6.h
@@ -161,6 +161,8 @@
   DEVCONF_DROP_UNSOLICITED_NA,
   DEVCONF_KEEP_ADDR_ON_DOWN,
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+  DEVCONF_RTR_SOLICIT_MAX_INTERVAL,
   DEVCONF_MAX
 };
 #endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */