* Makefile.am (do_subst): Fix the substitution of @configure_input@. (automake, aclocal): Create the output atomically and make it read-only, as done in the Autoconf package. * lib/Automake/Makefile.am (do_subst): Fix the substitution of @configure_input@. (Config.pm): Create the output atomically and make it read-only. * m4/Makefile.am ($(top_srcdir)/m4/amversion.m4): Substitute @configure_input@ and make the output read-only. * lib/Automake/Config.in, m4/amversion.in, tests/aclocal.in, tests/automake.in, tests/defs.in: Add a @configure_input@ line.