As discussed on Gitlab,¹ this Windows build script tries to discover SWIG, but
none of the Windows options for building Graphviz support compiling any of the
components that use SWIG.
¹ https://gitlab.com/graphviz/graphviz/-/issues/2277#note_1100714918
$build_utilities_path = "$GRAPHVIZ_ROOT\windows\dependencies\graphviz-build-utilities"
-find_or_fallback "swig" "$build_utilities_path"
find_or_fallback "win_bison win_flex" "$build_utilities_path\winflexbison"
find_or_fallback "makensis" "$build_utilities_path\NSIS\Bin"
find_or_fallback "cmake cpack" "$CMAKE_BIN"