sim: ppc: move libsim.a creation to top-level

The objects are still compiled in the subdir, but the creation of the
archive itself is in the top-level.  This is a required step before we
can move compilation itself up, and makes it easier to review.

The downside is that each object compile is a recursive make instead of
a single one.  It adds some overhead, so it's not great, but it shouldn't
be a big deal.  This will go away once compilation is hoisted up.

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