grep: toss in some explicit fflush()HEADmain

grep|tee of the src/ tree for infrequently-occurring strings is fairly
annoying; drop some tactical flushes at line-match boundaries to reduce
the long stalls.  In the case of `grep -o`, we'll flush after multiple
lines if there are multiple matches within a single line of text, while
for non`-o` we'll flush generally after every line.

0 files changed, 0 insertions, 0 deletions