autogen: let's make automake/aclocal 1.16 default tested version.

Let's have latest versions being basically the "recommended" tools
rather than oldest possible ones (which are still usable, as fallbacks).

Author: Jehan

autogen.sh

@@ -9,10 +9,10 @@
 # tools and you shouldn't use this script.  Just call ./configure
 # directly.
 
-ACLOCAL=${ACLOCAL-aclocal-1.13}
+ACLOCAL=${ACLOCAL-aclocal-1.16}
 AUTOCONF=${AUTOCONF-autoconf}
 AUTOHEADER=${AUTOHEADER-autoheader}
-AUTOMAKE=${AUTOMAKE-automake-1.13}
+AUTOMAKE=${AUTOMAKE-automake-1.16}
 LIBTOOLIZE=${LIBTOOLIZE-libtoolize}
 
 AUTOCONF_REQUIRED_VERSION=2.62