Bootstrapping from cvs

[Tom Tromey]

Today I updated autoconf from cvs for the first time in a long while.
A simple `configure; make' didn't work.  It tries repeatedly to run
autoconf, automake, etc.

Now, this is frustrating because the reason I'm building from cvs is
that I don't have these tools.  And, the generated files in the
repository are just fine.  So it is pointless to try to rebuild them.

I suggest we use AM_MAINTAINER_MODE.  I know this is not always
popular, but I think autoconf is a special case.  It is one of the few
tools that has this bootstrapping problem.

The current failure (after touching configure and "cvsdiscard"ing the
incorrectly rebuild Makefile.in's) looks like this:

make[1]: Entering directory `/home/tromey/gnu/Auto/autoconf/build/bin'
../tests/autom4te --language M4sh ../../autoconf/bin/autoconf.as -o 
../../autoconf/bin/autoconf.in
autom4te: cannot open /home/tromey/gnu/Auto/autoconf/build/lib/autom4te.cfg: No 
such file or directory
 at /home/tromey/gnu/Auto/autoconf/build/bin/autom4te line 428

(I don't know what this one means, unfortunately -- I've been out of
the loop too long!)

Tom