[Arma2] fix rcon issue with Battleye

Courgette, 

This speeds up UDP reads for the Battleye parser, and improves the unbanning issue.

Could you produce a win32 exe for him to try please?

ref:  http://forum.bigbrotherbot.net/arma-2/problem-unbanning-with-b3-%28locking-players-out-with-it%27s-ban-db%29/msg41441/#msg41441

Thanks!