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test C examples in CI

This patch series modifies the CI test setup to also install the package containing Graphviz development components (libraries, headers), and then adds some test cases that confirm the examples provided with Graphviz compile. As part of this, it also updates examples that did not compile as their API usage was out of date. The tests are currently skipped on Windows, but this can be enabled in future.

Thanks to @magjac for his help getting this working. I'll merge on 2020-07-11 if I don't hear objections.

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