gettext 0.10.39 & bison version

[Karl Berry]

The check for bison's version in the gettext.m4 included in gettext
0.10.39 does not work.  I believe this is because there is an extra
space in the pattern.

as distributed:
      ac_prog_version=`$INTLBISON --version 2>&1 | sed -n 's/^.*GNU Bison .* 
\([0-9]*\.[0-9.]*\).*$/\1/p'`
should be:
      ac_prog_version=`$INTLBISON --version 2>&1 | sed -n 's/^.*GNU Bison.* 
\([0-9]*\.[0-9.]*\).*$/\1/p'`

The string we're trying to match is, for example:
bison (GNU Bison) 1.29
which has only one space after the "Bison)" and before the version number.

Also, I wonder if just taking the last word would be better.  What if
there were a's or b's in the version number, for pretests or whatever?
Something like: s/^.*Bison.* \([^ ]*\)$/\1/p
Just a thought.

Thanks,
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