Fix arcdie crash when called with more then 1 variable argument

Add proper vararg handling to fix crash on 64 bit machines when arcdie gets
called with more then 1 variable argument.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
diff -up arc-5.21p/arcmisc.c~ arc-5.21p/arcmisc.c
--- arc-5.21p/arcmisc.c~	2010-08-07 15:06:42.000000000 +0200
+++ arc-5.21p/arcmisc.c	2015-01-16 16:10:29.322603290 +0100
@@ -4,6 +4,7 @@
  */
 
 #include <stdio.h>
+#include <stdarg.h>
 #include <ctype.h>
 #include "arc.h"
 
@@ -223,11 +224,13 @@ upper(string)
 }
 /* VARARGS1 */
 VOID
-arcdie(s, arg1, arg2, arg3)
-	char           *s;
+arcdie(const char *s, ...)
 {
+	va_list args;
 	fprintf(stderr, "ARC: ");
-	fprintf(stderr, s, arg1, arg2, arg3);
+	va_start(args, s);
+	vfprintf(stderr, s, args);
+	va_end(args);
 	fprintf(stderr, "\n");
 #if	UNIX
 	perror("UNIX");