vcpkg support/static builds

[Michał Janiszewski <janisozaur%gmail.com@localhost>]

Hi,

Together with some other people we are working on a project, OpenRCT2.

We use libzip there and have found it to be somewhat problematic to build a configuration we want for Windows, which is a static build.

Ted, our lead dev and all-around Windows guy, has submitted a request to have libzip packaged for vcpkg: https://github.com/Microsoft/vcpkg/pull/1305

As we are not so well-versed in CMake, can you please take a look at this change and consider upstreaming relevant parts?

Thanks in advance,

Michał

Note: I only am a broker here, I have not made any changes to libzip myself, but I'd be happy to collaborate.

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Michal Janiszewski