Put exported symbols of libz under our own control

This adds a Symbols.list containing the exported symbols like in other
libraries in base. If upstream adds new API this won't necessarily need
a bu

Put exported symbols of libz under our own control

This adds a Symbols.list containing the exported symbols like in other
libraries in base. If upstream adds new API this won't necessarily need
a bump on our side.

help/ok kettenis

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