fixed "configure.ac" filename in history section

[Steven G. Johnson]

It looks like someone was a little overzealous with the search-and-replace
when "configure.in" was renamed to "configure.ac".

2001-03-31  Steven G. Johnson  <address@hidden>

        * doc/autoconf.texi: Revert to "configure.in" in the history, since
        "configure.ac" wasn't used in the past, and in any case it is
        probably a good idea to preserve this section verbatim.

Index: autoconf.texi
===================================================================
RCS file: /cvs/autoconf/doc/autoconf.texi,v
retrieving revision 1.437
diff -u -r1.437 autoconf.texi
--- autoconf.texi       2001/03/30 12:50:29     1.437
+++ autoconf.texi       2001/04/01 00:33:52
@@ -10253,10 +10253,10 @@
 
 I considered using an architecture similar to that of Cygnus
 @code{configure}, where there is a single @code{configure} script that
-reads pieces of @file{configure.ac} when run.  But I didn't want to have
+reads pieces of @file{configure.in} when run.  But I didn't want to have
 to distribute all of the feature tests with every package, so I settled
 on having a different @code{configure} made from each
address@hidden by a preprocessor.  That approach also offered more
address@hidden by a preprocessor.  That approach also offered more
 control and flexibility.
 
 I looked briefly into using the Metaconfig package, by Larry Wall,