Autoconf 2.69 update

I'm proposing that we upgrade our Autoconf to 2.69, which is the latest
right now (release date 2012-04-24).  There are no changes in the source
needed, just tweak the version number in configure.in (see below) and
run autoreconf.  I've compared the configure output before and after on
a few boxes, and there were no significant changes.

The major benefit of this update is that configure shrinks to about half
the size and also runs a bit faster.

Maybe at this time, everyone who is interested can check that they have
an installation of Autoconf 2.69 around, and then in a few weeks we can
do the update.


diff --git a/configure.in b/configure.in
index a4baeaf..ac61be5 100644
--- a/configure.in
+++ b/configure.in
@@ -19,7 +19,7 @@ m4_pattern_forbid(^PGAC_)dnl to catch undefined macrosAC_INIT([PostgreSQL], [9.4devel],
[pgsql-bugs@postgresql.org])
-m4_if(m4_defn([m4_PACKAGE_VERSION]), [2.63], [], [m4_fatal([Autoconf version 2.63 is required.
+m4_if(m4_defn([m4_PACKAGE_VERSION]), [2.69], [], [m4_fatal([Autoconf version 2.69 is required.Untested combinations of
'autoconf'and PostgreSQL versions are notrecommended.  You can remove the check from 'configure.in' but it is thenyour
responsibilitywhether the result works or not.])])