Correct some buffer sizes.

- __vfprintf()'s 'buf' has never been used for floating point, so
  don't define it in terms of (incorrect) constants describing
  floating point numbers.  The actual size needed depends on
  sizeof(uintmax_t) and locale details, so I slightly overestimated.

- We don't need a 308-character buffer to store the string "308".
  With long doubles and %a we need more than three characters, though.

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