$NetBSD$

Fix inclusion of errno.h to work properly on e.g. Solaris.

--- rplayd/cdrom.c~	1999-03-10 02:58:02.000000000 -0500
+++ rplayd/cdrom.c	2009-05-18 00:54:06.000000000 -0400
@@ -34,7 +34,7 @@
 #ifdef HAVE_CDROM
 
 #include <sys/types.h>
-#include <sys/errno.h>
+#include <errno.h>
 #include "rplayd.h"
 #include "cdrom.h"
 
