Fix failure to build without iterable depset #221
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This fixes the issue raised in #218.
Depsets are not backed by hash sets do not have a trivial check for existence. Thus we need to explicitly flatten the depset into a list of headers before we see if the header is in the set.
I'm not clear enough on how bindgen works to propose a more elegant fix. Doing this check at all requires flattening to a list, and I don't know how/if we could avoid doing this check.