Removing warnings under Xcode 4.6
Removing warnings under Xcode 4.6

Signed-off-by: Daniel Garcia <113b1bd9aaea769647fce50610215906b285819a@gmail.com>

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lily4ever/GPUImage,picmonkey/GPUImage,catbus/GPUImage,nickplee/GPUImage,Slin/GPUImage,hakanw/GPUImage,cesare-montresor/GPUImage,ask-fm/GPUImage,rtsbtx/GPUImage,eighteight/GPUImage,pengleelove/GPUImage,pengleelove/GPUImage,haikusw/GPUImage,zakinaeem/GPUImage,zhengfuzhe2013/GPUImage,eighteight/GPUImage,Learn-IOS/GPUImage,loi32456/GPUImage,IncredibleDucky/GPUImage,SanjoDeundiak/GPUImage,HSFGitHub/GPUImage,xingyuniu/GPUImage,hyperconnect/GPUImage,0x4d52/GPUImage,cookov/GPUImage,AmiaoCat/GPUImage,AlanJN/GPUImage,0x4d52/GPUImage,zakinaeem/GPUImage,jakeva/GPUImage,Learn-IOS/GPUImage,hgl888/GPUImage,evfemist/GPUImage,jianwoo/GPUImage,FiftyThree/GPUImage,pcKanso/GPUImage,xqz001/GPUImage,msfeldstein/GPUImage,cocologics/GPUImage,csjlengxiang/GPUImage,jimydotorg/GGGPUImage,agan112/GPUImage,devluyy/GPUImage,mervekeles/GPUImage,KBvsMJ/GPUImage,u-engine/GPUImage,efremidze/GPUImage,bgulanowski/GPUImage,silvansky/GPUImage,inb4ohnoes/GPUImage,cnbin/GPUImage,Matzo/GPUImage,horaceho/GPUImage,sujeking/GPUImage,pengleelove/GPUImage,headupinclouds/GPUImage,wangwei1237/GPUImage,drewwilson/GPUImage,937447974/GPUImage,pheed/GPUImage,BlessNeo/GPUImage,mingming1986/GPUImage,tuo/GPUImage,YuAo/GPUImage,hgl888/GPUImage,xingyuniu/GPUImage,cesare-montresor/GPUImage,mervekeles/repo,wjszf/GPUImage,dachaoisme/GPUImage,mattwymore/GPUImage,hoanganhx86/GPUImage,hanangellove/GPUImage,odyth/GPUImage,zilaiyedaren/GPUImage,KBvsMJ/GPUImage,sprint84/GPUImage,mad102190/GPUImage,duanhjlt/GPUImage,hanangellove/GPUImage,DavidWangTM/GPUImage,zilaiyedaren/GPUImage,yshiga/GPUImage,Creolophus/GPUImage,Kevin775263419/GPUImage,inb4ohnoes/GPUImage,appone/GPUImage,AmiaoCat/GPUImage,howandhao/GPUImage,eighteight/GPUImage,cocologics/GPUImage,jackeychens/GPUImage,cocologics/GPUImage,DavidWangTM/GPUImage,mervekeles/GPUImage