Use of brackets with autoconf

[Julien ÉLIE]

Hi Russ,

>> I tried to use double brackets ("[[" and "]]") but it did not work.
>> I found out what Autoconf calls "quadrigraphs", for instance writing
>> "@<:@" instead of "[".
>>
>> That's not very useful to use...
>> Isn't there a better solution for our mere strings?
>
> Nope, quadrigraphs are what you're supposed to use.  The patch looks
> correct to me.

OK, just committed then.

Though it seems still weird that it works fine when there are no *spaces*
inside the brackets:
[Syslog facility [LOG_NEWS or LOG_LOCAL1]] does *not* work whereas
[Support for files larger than 2GB [default=no]] works fine.

Tested on Autoconf 2.61 and 2.63.
What made me see that is the fact that Autoconf 2.64 breaks with:
    error: possibly undefined macro: _m4_text_wrap_word
        If this token and others are legitimate, please use m4_pattern_allow.
        See the Autoconf documentation.

Using quadrigraphs or removing spaces solve the issue.

-- 
Julien ÉLIE

« Il était une fois un homme fidèle, c'est une belle histoire.
  Il était une fois une femme fidèle, c'est un conte de fées. » (Maurice Jeanneret)