Add missing include (Fix build on *NIX/Clang)

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Автор: cala


<pre style='white-space:pre-wrap;width:81ex'>Add missing include (Fix build on *NIX/Clang)</pre>


Подробнее... (https://github.com/cmangos/mangos-wotlk/commit/da5b87d17b20610b29f65e0d1b37070d513ea90f)