[autoconf] hacking with config.status

[Benoit Hudson]

I have two problems with running config.status:
        it's flaky when you change CONFIG_FILES and CONFIG_HEADERS
        (for instance, instead of deleting the output file on a signal,
         it deletes all my makefiles)

        it can't be run concurrently (as in a make -j2).

I know how to fix these problems, by modifying the config.status file
slightly.  Where in autoconf would I look to do this consistently?

        -- Benoît