* devices.h: Switch FH_ZERO and FH_PORT as on Linux. Add FH_FULL.

	* devices.h: Switch FH_ZERO and FH_PORT as on Linux.  Add FH_FULL.
	* devices.in: Add /dev/full.
	* devices.cc: Regenerate.
	* dtable.cc (build_fh_pc): Add FH_FULL.
	* fhandler.cc (fhandler_base::fstat): Set FH_FULL permission bits
	correctly.
	* fhandler_zero.cc (fhandler_dev_zero::write): Set errno to ENOSPC
	and return -1 if device is FH_FULL.