Patch to update libtool in GCC and Src trees

[Paolo Bonzini]

> Attached are the various changelogs for GCC and the src tree, the one 
> diff for src-release, and then an attachment with the ToT libtool that I 
> have been using for testing.

What was the status of AIX testing?  If that and Cygwin (possibly 
including winsup/newlib -- CCing Charles Wilson) are ok, the patch can 
go in as far as I'm concerned.  Sorry if I'm being extra safe, but the 
hardest to maintain parts are in now.

Paolo