Split off OpenBSD code into a separate implementation

Move OpenBSD code into its own sysdeps directory. The changes from
bsd/ were becoming to hard to maintain as a #ifdef tree. This is
what's currently being distributed as part of OpenBSD ports.

sysdeps/openbsd/close.c

@@ -0,0 +1,32 @@
+/* $OpenBSD: close.c,v 1.2 2011/05/23 19:35:53 jasper Exp $	*/
+
+/* Copyright (C) 1998 Joshua Sled
+   This file is part of LibGTop 1.0.
+
+   Contributed by Joshua Sled <jsled@xcf.berkeley.edu>, July 1998.
+
+   LibGTop is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License,
+   or (at your option) any later version.
+
+   LibGTop is distributed in the hope that it will be useful, but WITHOUT
+   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+   for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with LibGTop; see the file COPYING. If not, write to the
+   Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.
+*/
+
+#include <config.h>
+#include <glibtop.h>
+#include <glibtop/close.h>
+
+/* Closes pipe to gtop server. */
+
+void
+glibtop_close_p (glibtop *server)
+{ }