IcedTea PPC stuff, part 2 of 2

[Gary Benson]

Hi all,

In order to build IcedTea on PPC there are a load of extra files that
need dropping into the build tree.  The way I propose doing this is
to have a new directory, "ports", the contents of which are linked
into the build trees via the rules in the attached Makefile patch.
Obviously there will only be PPC stuff in there for now, but I kept
the rules generic so you can drop other ports in there without needing
to edit anything.

Ok to commit?

Cheers,
Gary