192f4144b2
Instead of intersecting system strings, we filter with the sort of patterns used in `meta.platforms`. Indicating this change `forTheseSystems` has been renamed to `forMatchingSystems`, since the given list is now patterns to match, and not the systems themselves. [Just as with `meta.platforms`, systems strings are also supported for backwards compatibility.] This is more flexible, and makes the `forMatchingSystems` and packagePlatforms` cases more analogous.
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