Update.

Update.

	* libio/genops.c (_IO_list_all_stamp): New variable.
	(_IO_un_link): Bump _IO_list_all_stamp after removing from list.
	(_IO_link): Likewise for insertion.
	(flush_cleanup): New function.
	(_IO_flush_all): Get list_all_lock and all individual locks for the
	streams.  Detect and handle changes to the _IO_list_all list.
	(_IO_flush_all_linebuffered): Likewise.
	* sysdeps/generic/bits/stdio-lock.h: Define
	_IO_cleanup_region_start_noarg.
	* sysdeps/mach/hurd/bits/stdio-lock.c: Likewise.