Build fix: make make less confused about filter-out
It seems the filter-out rules were expanded at different times, producing different output than when creating the prerequisites. So it didn't filter them out. Now we leave the first one out by $< ‒ which must be the same. We leave the second one in there. But that one is used by the script ‒ we remove it from listing it explicitly. A bit of a hack, but it seems to work better.
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