Fix compile issue in gcc 4.6
Fix compile issue in gcc 4.6

EvilHero90/otclient,kwketh/otclient,dreamsxin/otclient,EvilHero90/otclient,kwketh/otclient,Radseq/otclient,Cavitt/otclient_mapgen,Radseq/otclient,dreamsxin/otclient,gpedro/otclient,Cavitt/otclient_mapgen,gpedro/otclient,dreamsxin/otclient,gpedro/otclient