pfg 0e774f6016 mbtowc(3): set errno to EILSEQ if an incomplete character is passed.
According to POSIX, The mbtowc() function shall fail if:
[EILSEQ] An invalid character sequence is detected.

Reviewed by:		bapt
Differential Revision:	https://reviews.freebsd.org/D5496

Obtained from:	OpenBSD (Ingo Schwarze)
MFC after:	1 month
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