autoreconf in repo-usage.html

[Torbjorn Granlund]

Marc Glisse <marc.glisse at inria.fr> writes:

  Hello,
  
  in http://gmplib.org/devel/repo-usage.html , we say:
  
  "Do not use autoreconf; it will overwrite config.guess which in turn
  will cause any builds to be awful."
  
  However, .bootstrap runs autoreconf... Maybe we should be more
  specific and say:
  
  "Do not use autoreconf -f; it will..."
  
I cannot recall under which circumstabces autoreconf naughtily replaces
our config.guess.  The autoreconf man page isn't entirely enlightening.

Feel free to improve the web page wording.

(The publication script doesn't currently work, due to web page
migration.)

-- 
Torbjörn