gcc mainline does not build on apple-ppc-darwin

[DJ Delorie]

> Yikes, sorry, will fix by copying over the needed libiberty files.

Um, not in cvs please.  Copying at build time is OK.

> (Using them via -libiberty doesn't work because libmudflap uses
> libtool to build static+shared libs, and libiberty doesn't.)

Feel free to add libtool to libiberty.  I don't think there's any
reason it has been withheld so far, aside from volunteers.

However, a shared libiberty library would normally not be installed.
It's probably better to link the static libiberty.a even when building
a shared library yourself (i.e. link ../libiberty/libiberty.a
explicitly).