Update to kernel headers v4.7.2.

Modify the kernel header update script to rename C++ keyword
struct members to something else. This fixes problems when including
these kernel files in C++ code.

Also, make a manual change to linux/fib_rules.h and comment out the
value FRA_PAD since it conflicts with a special android kernel value
FRA_UID_START that has not been upstreamed yet.

Test: Built aosp_angler, aosp_x86_64, aosp_mips (bionic only)
Test: Booted on angler and ran bionic unit tests
Test: Built these changes in internal master

Change-Id: Ia22b7e3ca409404696dba76311f49157f4a9ceed
diff --git a/libc/kernel/uapi/linux/ip.h b/libc/kernel/uapi/linux/ip.h
index a56f1d6..d8dac9c 100644
--- a/libc/kernel/uapi/linux/ip.h
+++ b/libc/kernel/uapi/linux/ip.h
@@ -174,8 +174,11 @@
   IPV4_DEVCONF_IGMPV2_UNSOLICITED_REPORT_INTERVAL,
   IPV4_DEVCONF_IGMPV3_UNSOLICITED_REPORT_INTERVAL,
   IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN,
-  __IPV4_DEVCONF_MAX
+  IPV4_DEVCONF_DROP_UNICAST_IN_L2_MULTICAST,
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+  IPV4_DEVCONF_DROP_GRATUITOUS_ARP,
+  __IPV4_DEVCONF_MAX
 };
 #define IPV4_DEVCONF_MAX (__IPV4_DEVCONF_MAX - 1)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
 #endif