RFA: handle .gdb_index version 6

[Tom Tromey]

We recently bumped the .gdb_index version to 6.
The format is the same, but version 6 indices hold information about
inlined functions as well.

This patch changes readelf to cope.

Ok?

Tom

2012-03-21  Tom Tromey  <tromey@redhat.com>

	* dwarf.c (display_gdb_index): Handle index version 6.

Index: dwarf.c
===================================================================
RCS file: /cvs/src/src/binutils/dwarf.c,v
retrieving revision 1.108
diff -u -r1.108 dwarf.c
--- dwarf.c	15 Feb 2012 18:32:30 -0000	1.108
+++ dwarf.c	21 Mar 2012 16:47:20 -0000
@@ -1,5 +1,5 @@
 /* dwarf.c -- display DWARF contents of a BFD binary file
-   Copyright 2005, 2006, 2007, 2008, 2009, 2010, 2011
+   Copyright 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
    Free Software Foundation, Inc.
 
    This file is part of GNU Binutils.
@@ -5551,6 +5551,9 @@
       warn (_("Version 4 does not support case insensitive lookups.\n"));
       break;
     case 5:
+      warn (_("Version 5 does not include inlined functions.\n"));
+      break;
+    case 6:
       break;
     default:
       warn (_("Unsupported version %lu.\n"), (unsigned long) version);