[Bug build/14120] build process creates autom4te.cache directory in source dir

["eblake at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=14120

--- Comment #7 from Eric Blake <eblake at redhat dot com> ---
Here's the culprit in your configure.in (by the way, newer autotools recommend
the name configure.ac, not .in):

AC_CHECK_PROGS(AUTOCONF, autoconf, no)
case "x$AUTOCONF" in
xno|x|x:) AUTOCONF=no ;;
*)
  AC_CACHE_CHECK(dnl
whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
  if (cd $srcdir; $AUTOCONF $ACFLAGS configure.in > /dev/null 2>&1); then
    libc_cv_autoconf_works=yes
  else
    libc_cv_autoconf_works=no
  fi])
  test $libc_cv_autoconf_works = yes || AUTOCONF=no
  ;;
esac
if test "x$AUTOCONF" = xno; then
  aux_missing="$aux_missing autoconf"
fi

Fix that macro to quit trying to run autoconf in $(srcdir) as part of
configure, and you will no longer be stuck with a cache file in $(srcdir).

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