[crossfire] Remember to replace config.{sub,guess} for releases

[Kari Pahula]

The config.sub and config.guess files are used by configure to
determine architecture depentand features of the system.  The
autotools don't replace them themselves, but you have to update them
yourself from time to time.

The current config.sub and config.guess files in crossfire date back
to 2001-09-07 and client's files are from 2003-06-18.  It would be a
good idea to replace them for the next release.