We cannot use fputs(3) in passthrough() because the stdout stream

might be in stdio wide orientation due to prior formatting of an
unformatted manual in man -aTutf8 mode.  So for now, use fflush(3)
followed by unbuffered write(2) instead.  Fixes output corruption
on glibc discovered on Linux while testing a diff to fix a loosely
related bug reported by <jmates at ee dot washington dot edu>.

I detest the concept of stdio stream orientation.  One day, i will
rewrite term_ascii.c to always use narrow streams, even in UTF-8
output mode.  But that's too much work for today.

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