Detail required build environment tools

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+The OpenLDAP build environment relies on non-standard versions of
+configuration tools:
+       Autoconf 1.13.1
+       Automake 1.4a
+       Libtool 1.3.5 w/ patches
+
+The autoconf/automake releases used are available at:
+       ftp://ftp.openldap.org/pub/tools/
+
+The libtool release used is available from:
+       ftp://ftp.gnu.org/
+
+but with ltconfig and ltmain.sh replaced with versions found in
+this directory.