Update kernel headers to v3.18.3.

Bug: 19127803
Change-Id: I67fa0832322ddd0032d909476047578be052bcf2
diff --git a/libc/kernel/uapi/linux/binder.h b/libc/kernel/uapi/linux/binder.h
index 7a5cee5..38ae5c3 100644
--- a/libc/kernel/uapi/linux/binder.h
+++ b/libc/kernel/uapi/linux/binder.h
@@ -126,7 +126,7 @@
  __u32 handle;
  binder_uintptr_t cookie;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
-} __attribute__((packed));
+} __packed;
 struct binder_pri_desc {
  __s32 priority;
  __u32 desc;