i plan to exapnd the size of mbstate_t from 32bytes to 128bytes,
	so that we can hold intermediate state for multibyte handling code
	better.  sorry for the mess, i should have checked it beforehand.
	please rebuild libc as a whole when i commit the change.
	(i'm aware of only one place which uses mbstate_t -
	lib/libc/stdio/vfprintf.c)
	incompatibility window is like 5 days.

itojun