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suppress two compiler warnings

Matthew Fernandez requested to merge smattr/graphviz:615aeb22-3c3f-43de-a7d4-e4d13756436f into master

Commits 02d2cacf and 80a9dc3a accidentally introduced two new compiler warnings to the build. Following this change, the CMake build returns to warning-free on Linux with GCC 8.3.0. The Autotools build still sprays warnings, but I think it's worth taking proactive steps like this to never introduce new warnings.

Though this change looks like it has a semantic effect, it does not. The base member of these structs is the first member, used as an inheritance-style pattern.

I'll merge on 2020-08-22 if there are no objections.

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