[m-rev.] for post-commit review: classify oc_link options by target language

[Zoltan Somogyi]

For review by anyone.

The diff to handle_options.m points out what may be a bug, but I cannot tell,
because the only effect is on the value of an option whose meaning I don't understand:
default_runtime_library_directory. Does anyone else know? The obvious fix is
to switch the order of the two calls involved, but my guess iis that if that happens
to be wrong, we don't have an automatic test catch it. Can anyone confirm or
deny that?

Zoltan.
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