Update to m4 1.4.16, AM 1.11.1, AC 2.68, and LT 2.4 per

http://www.open-mpi.org/community/lists/devel/2011/07/9492.php. 

This commit was SVN r24870.

contrib/dist/make_dist_tarball

@@ -22,10 +22,10 @@
 # Version of auto tools that we want
 #
 
-M4_TARGET_VERSION=1.4.13
-AM_TARGET_VERSION=1.11
-AC_TARGET_VERSION=2.65
-LT_TARGET_VERSION=2.2.6b
+M4_TARGET_VERSION=1.4.16
+AM_TARGET_VERSION=1.11.1
+AC_TARGET_VERSION=2.68
+LT_TARGET_VERSION=2.4
 FLEX_TARGET_VERSION=2.5.35
 
 #