Convert from ISO8859-1 to UTF-8 to avoid:
ifstat.c:493:37: warning: illegal character encoding in string literal [-Winvalid-source-encoding]
and incorrect output when running "ifstat -v".
--- ifstat.c.orig	2003-11-21 19:27:51.000000000 -0600
+++ ifstat.c	2021-06-26 02:25:39.000000000 -0500
@@ -1,6 +1,6 @@
 /*
  * ifstat - InterFace STATistics
- * Copyright (c) 2001, Gaël Roualland <gael.roualland@dial.oleane.com>
+ * Copyright (c) 2001, Gaël Roualland <gael.roualland@dial.oleane.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -490,7 +490,7 @@
 	break;
       case 'v':
 	printf("ifstat version %s.\n"
-	       "Copyright (C) 2001-2003, Gaël Roualland <gael.roualland@dial.oleane.com>\n",
+	       "Copyright (C) 2001-2003, Gaël Roualland <gael.roualland@dial.oleane.com>\n",
 	       ifstat_version);
 	opt = ifstat_list_drivers();
 	printf("Compiled-in drivers: %s.\n", (opt != NULL) ? opt : "");