cmTarget: Avoid copying container we don't need to copy.
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@ -1220,7 +1220,7 @@ void cmTarget::GetDirectLinkLibraries(const std::string& config,
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&dagChecker),
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libs);
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std::set<std::string> seenProps = cge->GetSeenTargetProperties();
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std::set<std::string> const& seenProps = cge->GetSeenTargetProperties();
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for (std::set<std::string>::const_iterator it = seenProps.begin();
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it != seenProps.end(); ++it)
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{
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