Custom zlib for Windows builds

[Graham Bloice <graham.bloice () trihedral com>]

The remaining CMake warnings for Windows are caused by zlib, as newer CMake
versions complain about policy settings.

As the zlib maintainers seem very reluctant to incorporate changes (31 pull
requests at the moment oldest from 2 years ago) to fix this we would have
to roll our own zlib for download.

The changes required are minimal, but we do do this we could also usefully
incorporate another change on their pull requests to disable the building
of the example binaries.

Thoughts?

-- 
Graham Bloice

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