Correct value for _POSIX_AIO_LISTIO_MAX in <limits.h>.
Correct value for _POSIX_AIO_LISTIO_MAX in <limits.h>.

All the "Minimum Values" (POSIX.1-2008 XBD 13 Headers <limits.h>) are now
correct. These should all be exactly as they are in the specification; the
possibly higher values we support are announced differently.

PR:		standards/104743
Submitted by:	gcooper
MFC after:	2 weeks

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