FreeBSD_STABLE_11-arm64 - Build #111 - Fixed

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FreeBSD_STABLE_11-arm64 - Build #111 - Fixed:

Build information: https://jenkins.FreeBSD.org/job/FreeBSD_STABLE_11-arm64/111/
Full change log: https://jenkins.FreeBSD.org/job/FreeBSD_STABLE_11-arm64/111/changes
Full build log: https://jenkins.FreeBSD.org/job/FreeBSD_STABLE_11-arm64/111/console

Change summaries:

305404 by ache:
MFC r305241

fgetwc(3) may set both __SEOF and __SERR at once (in case of incomplete
sequence near EOF), so we can't just check for
(wc == WEOF && !__sfeof(fp)) and must relay on __sferror(fp) with
__SERR clearing/restoring.