Enable the in-tree toolchain on sh5, at least for the time being so I
can evaluate the situation.
There are still numerous problems with gcc3's sh5 support, not least
of which is the fact that a native gcc3 doesn't work at all. As a
cross-compiler, it works reasonably well. Certainly enough to build
userland and kernel code.
Binutils also has problems dealing with shared libraries on sh5, so
we're back to static userland for now.
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