[PATCH] Fix $m4dirs count

[Robert Millan]

$m4dirs is incorrectly counting.  In my particular case
(correct value: 0, detected value: 1), this resulted in gnulib-tool
silently exitting with no visible error (and no job done).

-- 
Robert Millan

  The DRM opt-in fallacy: "Your data belongs to us. We will decide when (and
  how) you may access your data; but nobody's threatening your freedom: we
  still allow you to remove your data and not access it at all."

fix_m4dirs_count.diff
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