* exception.h (_exception_list): Drop redefinition for x86_64.
	* include/exceptions.h: Disable content for x86_64 since it's not
	using frame based exception handling anymore.
	* devices.in (dev_storage): Map /dev/dsp to \Device\Null.
	* devices.cc: Regenerate.
	* fhandler_dsp.cc (fhandler_dev_dsp::open): Call fhandler_base::open.
	(fhandler_dev_dsp::close): Call fhandler_base::close.
	(fhandler_dev_dsp::fixup_after_fork): Call
	fhandler_base::fixup_after_fork.

	* fhandler_raw.cc (fhandler_dev_raw::fixup_after_fork): Call
	fhandler_base::fixup_after_fork.