* autoconf.in ($AWK): Remove, no longer used.

* autoconf.in ($AWK): Remove, no longer used.
* test/tools.at: Use AT_CHECK_AUTOCONF.
(AWK portability): Remove, for autoconf no longer uses AWK.
(Syntax of the Perl scripts): New.
* configure.ac: autoconf no longer needs an AWK with a good
regexp engine.
Use a static test on AC_PACKAGE_VERSION.
* autom4te.in (&up_to_date_p): Output depends on the arguments.
* lib/autoconf/Makefile.am: Ship version.m4, maintainer file.
* tests/atconfig.in (PERL): New.