RFA: darwin PATCH to fix build, internal visibility

[Jason Merrill]

This patch fixes a couple of Darwin issues I noticed with a cross-compiler:

1) Adds a couple of consts to avoid const-correctness errors.
2) Treats visibility "internal" like "hidden" rather than like 
"default".  The documentation says that internal is hidden + 
processor-specific semantics, so treating it as just hidden makes sense 
to me.

OK for trunk?

Jason
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