updating libtool, etc.

[David Edelsohn]

>>>>> Geoff Keating writes:

Geoff> Does anyone mind if I update libtool to the latest released version,  
Geoff> 1.5.18, and regenerate everything with automake 1.9.5?

	If everyone agrees to go forward with this, please work with Mark
to schedule a freeze on all other GCC development so that everyone can
test the effect of this change on his or her platform without the
confusion of other patches.

Thanks, David