Convert arcdie to variadic function, which solves the issue with
-Werror=implicit-int enabled.

Bug: https://bugs.gentoo.org/870517

diff --git a/arcmisc.c b/arcmisc.c
index ea12b41..3d6272e 100644
--- a/arcmisc.c
+++ b/arcmisc.c
@@ -3,6 +3,7 @@
  * $Header: /cvsroot/arc/arc/arcmisc.c,v 1.4 2005/10/09 01:38:22 highlandsun Exp $ 
  */
 
+#include <stdarg.h>
 #include <stdio.h>
 #include <ctype.h>
 #include "arc.h"
@@ -223,11 +224,14 @@ upper(string)
 }
 /* VARARGS1 */
 VOID
-arcdie(s, arg1, arg2, arg3)
-	char           *s;
+arcdie(char * s, ...)
 {
+	va_list ap;
+
 	fprintf(stderr, "ARC: ");
-	fprintf(stderr, s, arg1, arg2, arg3);
+	va_start(ap, s);
+	vfprintf(stderr, s, ap);
+	va_end(ap);
 	fprintf(stderr, "\n");
 #if	UNIX
 	perror("UNIX");
-- 
2.35.1