lio_listio should emit an event for each individual request in

lio_listio should emit an event for each individual request in

	addition to the global event.
	* sysdeps/pthread/lio_listio.c (lio_listio): Renamed to
	lio_listio_internal.  Remove mode parameter check.  Only set sigevent
	type ti SIGEV_NONE if LIO_NO_INDIVIDUAL_EVENT is set.
	(__lio_listio_21): New function.  Compatiblity version which sets
	LIO_NO_INDIVIDUAL_EVENT before calling lio_listio_internal.
	(__lio_listio_item_notify): New function.
	* sysdeps/pthread/lio_listio64.c: Define __lio_listio_21 and
	__lio_listio_item_notify macros.
	* sysdeps/pthread/Versions: New file.
	* rt/tst-aio2.c: Adjust test for new semantics of lio_listio.
	* include/aio.h: Define LIO_NO_INDIVIDUAL_EVENT.
	* Versions.def: Add GLIBC_2.4 for librt.

	* rt/Versions: Whitespace fix.
	* sysdeps/pthread/aio_misc.c: Likewise.