Simplify build.rs lookup
#39
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`file_names_in()` can fail in two relevant ways: - If the requested folder does not exist it fails with a `NotFound` error. Since we are requesting `.` this cannot happen. - If anything else IO-related fails we don't want to silently ignore it, instead we want to propagate that fact to the caller.
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file_names_in()can fail in two relevant ways:NotFounderror. Since we are requesting.this cannot happen.