[ghex] Get rid of implicit declaration warning for strlen

[Andre Klapper <aklapper src gnome org>]

commit 81e83cb2612daddf21297f7cf5abcc21623a3dbb
Author: Andre Klapper <a9016009 gmx de>
Date:   Wed Jan 27 20:10:40 2010 +0100

    Get rid of implicit declaration warning for strlen

 src/gtkhex.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/gtkhex.c b/src/gtkhex.c
index 48c1ec0..b28a355 100644
--- a/src/gtkhex.c
+++ b/src/gtkhex.c
@@ -25,6 +25,8 @@
 #  include <config.h>
 #endif /* HAVE_CONFIG_H */
 
+#include <string.h>
+
 #include <gdk/gdkkeysyms.h>
 
 #include "hex-document.h"