* configure.in: Bump version to 1.6b.
* lib/config.guess, lib/config.sub, lib/Automake/XFile.pm: New
upstream versions.
* automake.in: Don't write @ALLOCA@ and @LIBOBJS@ in clear text,
since this file is processed by config.status.
* Makefile.am (FETCHFILES): Add Automake/XFile.pm.
(fetch): Fetch XFile.pm. Update the files in $(srcdir) instead
of asking the maintainer to do it manually.
* lib/config.guess, lib/config.sub, lib/texinfo.tex,
Automake/XFile.pm: New upstream versions.
* lib/Automake/Struct.pm: Update from Autoconf.
* lib/Automake/General.pm, lib/Automake/XFile.pm: New, from CVS
Autoconf.
* automake.in: Use them.
(&uniq, $me): Remove, as they are provided by Automake::General.
