bug#18750: --line-buffered option doesn't work with --files-with-matches

[Paul Eggert]

Thanks for the bug report. It also seems to me that --line-buffered should apply 
to nulls, not newlines, when -z is used. Also, there are a couple of other 
places where stdout should get flushed after a newline. Perhaps we should use 
setvbuf instead (is it faster?) when -z is not also used, but right now I just 
want to get the bug fixed for the next release, so I installed the attached, 
more-conservative, patch, and am marking this bug as done.

0001-grep-fix-l-line-buffer-bug.patch
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