Runtime version retrieval.

[Remi Collet <remi%fedoraproject.org@localhost>]

Hi,

I think it can be useful to be able to get both buildtime and runtime
versions of the library.

Context: in phpinfo page we are used to display both versions,
which can be useful for support.

Ex:
Libzip headers version => 1.2.0
Libzip library version => 1.3.0


PR open on github
https://github.com/nih-at/libzip/pull/10

Patch:
https://patch-diff.githubusercontent.com/raw/nih-at/libzip/pull/10.patch


TODO:
Only tested on linux, probably some changes needed for Windows (and
perhaps some other OS)



Remi

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