Explicitly set visibility for external API functions, idea from Marc Provost.

--HG--
branch : HEAD

lib/zip_error_strerror.c

diff --git a/lib/zip_error_strerror.c b/lib/zip_error_strerror.c
index 521a83f..91c5b83 100644
--- a/lib/zip_error_strerror.c
+++ b/lib/zip_error_strerror.c
@@ -1,8 +1,6 @@
 /*
-  $NiH: zip_error_strerror.c,v 1.4 2006/02/21 09:41:00 dillo Exp $
-
   zip_error_sterror.c -- get string representation of struct zip_error
-  Copyright (C) 1999, 2003 Dieter Baron and Thomas Klausner
+  Copyright (C) 1999-2007 Dieter Baron and Thomas Klausner
 
   This file is part of libzip, a library to manipulate ZIP archives.
   The authors can be contacted at <nih@giga.or.at>
@@ -40,7 +38,6 @@
 #include <stdlib.h>
 #include <string.h>
 
-#include "zip.h"
 #include "zipint.h"