Upgrade to tcpdump 4.7.4.

Bug: http://b/24902618
Change-Id: I7c3605015d90453b0a8c339b1774e285796f8775
diff --git a/gmpls.h b/gmpls.h
index 8db99de..8b44f94 100644
--- a/gmpls.h
+++ b/gmpls.h
@@ -1,5 +1,4 @@
-/* @(#) $Header: /tcpdump/master/tcpdump/gmpls.h,v 1.5 2006-04-14 07:11:59 hannes Exp $ (LBL) */
-/* 
+/*
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that: (1) source code
  * distributions retain the above copyright notice and this paragraph