[12911] Add separate cmake file for unix platform

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Автор: stfx


<pre style='white-space:pre-wrap;width:81ex'>[12911] Add separate cmake file for unix platform</pre>


Подробнее... (https://github.com/cmangos/mangos-wotlk/commit/d296ef34a472104a47eed98ab94cf1b62f9b729b)