Use system zlib when available, tested on archlinux

[tobchem]

Haven't worked with meson before, so I hope it does not break things on other platforms. See here: http://mesonbuild.com/Dependencies.html

[mooskagh]

Why not just use bundled one if it's included in sources anyway?

[Error323]

This allows compilation without warnings probably? Op wo 23 mei 2018 18:38 schreef Alexander Lyashuk <[email protected]

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[tobchem]

It basically skips compilation on systems when it finds a pre-installed zlib.

I don't see a need to use an extra version of zlib, if the same version is already installed on my machine anyway.

[mooskagh]

While I think there's no substantial reason to chose one variant over another, a have some weak arguments for always using zlib built from source (better than "I don't see a need"):

• Fewer configuration variants-> fewer things that can possibly break, and easier to notice when they do break.
• Also using system library makes it (a tiny bit) less likely to work on another machine after compilation and copy.

As for for warnings, they fixed it in meson wrap github already, but didn't push a new wrapdb revision.