Add cygwin graphviz dependency to conf-graphviz

fdopen / opam-repository-mingw

windows package repository for OPAM (mingw and msvc)

https://fdopen.github.io/opam-repository-mingw/

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Add cygwin graphviz dependency to conf-graphviz #68

Closed MercierCorentin closed 4 years ago

MercierCorentin commented 4 years ago

On Cygwin, graphviz package exists, this PR enables, if depext-cygwinports is installed, users to download graphviz package directly from the opam depext command.

fdopen commented 4 years ago

Thanks, cherry picked and edited in 94f0baaa3d2b6d9259c3a7804177c5e5f6b73cd2