Update to kernel headers v4.12.3.

Test: Built angler.
Change-Id: Icbcf4fac2334de8409b049ed7a3b4c24b4e98ce9
diff --git a/libc/kernel/uapi/linux/packet_diag.h b/libc/kernel/uapi/linux/packet_diag.h
index f0b7525..35d5413 100644
--- a/libc/kernel/uapi/linux/packet_diag.h
+++ b/libc/kernel/uapi/linux/packet_diag.h
@@ -70,7 +70,7 @@
   __u32 pdmc_count;
   __u16 pdmc_type;
   __u16 pdmc_alen;
-  __u8 pdmc_addr[MAX_ADDR_LEN];
+  __u8 pdmc_addr[32];
 };
 struct packet_diag_ring {
   __u32 pdr_block_size;