recipe: ensure LINEBUF has a minimum

Might come in handy:

  LB_min = 8192

  :0
  *$ -$LINEBUF^0
  *$   $LB_min^0
  { LINEBUF=$LB_min }



I first thought I would need to do
  LINEBUF = ${LINEBUF:-$LB_min}
right after the setting of LB_min 
but that's not necessary.

-- 
Affijn, Ruud

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