[PATCH] wc: line-buffer the printed counts

[Pádraig Brady]

wc is a essentially a digesting function like sha etc.
in that it produces a 1 line summary per file.
The attached patch ensures that those lines are output
atomically for concurrent wc processes.

Note in general one can use `stdbuf -oL cmd` to line-buffer
a process which outputs to stdout, but I think this
should be done internally in this case.

Note also that for commands which don't use stdio for output,
one could use sed to to the line buffering `cmd | sed -n p`.

cheers,
Pádraig.

wc-atomic.diff
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