Upgrade to libtool-1.5.6.

ChangeLog

@@ -1,3 +1,11 @@
+2004-08-25  Bruno Haible  <bruno@clisp.org>
+
+	* autoconf/ltmain.sh: Upgrade to libtool-1.5.6.
+	* m4/libtool.m4: New file, from libtool-1.5.6 with modifications:
+	2004-02-22  Bruno Haible  <bruno@clisp.org>
+		* m4/libtool.m4: Add support for Comeau C++ on Linux.
+		Reported by Prof. Roberto Bagnara <bagnara@cs.unipr.it>.
+
 2004-08-19  Bruno Haible  <bruno@clisp.org>
 
 	* include/cln/modules.h (CL_GLOBALIZE_JUMP_LABEL, CL_JUMP_TO): When