two problems where fixes are needed

[NIIBE Yutaka]

Both problems are fixed in master.

I read: https://www.gnu.org/software/gnulib/manual/gnulib.html#snprintf

For systems which require the old style of snprintf like:

      snprintf (line, DIM(line)-1, "SETERROR %s", initial_errtext);
      line[DIM(line)-1] = 0;

I think that it is better to detect such snprintf by configure
to be replaced by substitute.
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