fix fallout from the removal of dkio.h from ioctl.h

sysutils/e2fsprogs/patches/patch-lib_blkid_getsize_c

@@ -0,0 +1,11 @@
+$OpenBSD: patch-lib_blkid_getsize_c,v 1.1 2010/05/20 15:00:18 naddy Exp $
+--- lib/blkid/getsize.c.orig	Thu May 20 16:14:24 2010
++++ lib/blkid/getsize.c	Thu May 20 16:14:36 2010
+@@ -25,6 +25,7 @@
+ #include <fcntl.h>
+ #ifdef HAVE_SYS_IOCTL_H
+ #include <sys/ioctl.h>
++#include <sys/dkio.h>
+ #endif
+ #ifdef HAVE_LINUX_FD_H
+ #include <linux/fd.h>