build: switch to C++17
Change-Id: Id6217b5c993f3e4726e89773128b565e5f136bb6
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[](https://github.com/named-data/ndn-tools/actions/workflows/ci.yml)
[](https://github.com/named-data/ndn-tools/actions/workflows/docs.yml)
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+

**ndn-tools** is a collection of basic tools for [Named Data Networking](https://named-data.net/).