Upgrade the nightly tarball autoconf bootstrapping to:

- AC 2.69
- AM 1.12.1
- LT 2.4.2
- m4 1.4.16

This commit was SVN r26705.

contrib/dist/make_dist_tarball

@@ -23,8 +23,8 @@
 #
 
 M4_TARGET_VERSION=1.4.16
-AM_TARGET_VERSION=1.11.3
-AC_TARGET_VERSION=2.68
+AM_TARGET_VERSION=1.12.1
+AC_TARGET_VERSION=2.69
 LT_TARGET_VERSION=2.4.2
 FLEX_TARGET_VERSION=2.5.35