[core] Don't build the iOS 6 functionality with older SDKs.
[core] Don't build the iOS 6 functionality with older SDKs.

zaichang/nimbus,Arcank/nimbus,kisekied/nimbus,ycaihua/nimbus,dieface/nimbus,andaluz/nimbus,andaluz/nimbus,chanffdavid/nimbus,Guokr1991/nimbus,michaelShab/nimbus,chanffdavid/nimbus,kviksilver/nimbus,xiaohongjun0509/nimbus,JyHu/nimbus,treejames/nimbus,DreamHill/nimbus,chanffdavid/nimbus,ycaihua/nimbus,djMax/nimbus,DreamHill/nimbus,mohsinalimat/nimbus,djMax/nimbus,Arcank/nimbus,jverkoey/nimbus,zaichang/nimbus,veue/nimbus,mohsinalimat/nimbus,marcobgoogle/nimbus,bogardon/nimbus,Guokr1991/nimbus,xiaohongjun0509/nimbus,bangquangvn/nimbus,dachaoisme/nimbus,Arcank/nimbus,andaluz/nimbus,compositeprimes/nimbus,JyHu/nimbus,LcongGitHub/nimbus,liuwu/nimbus,kisekied/nimbus,0xced/nimbus,cnbin/nimbus,cnbin/nimbus,0xced/nimbus,jverkoey/nimbus,bogardon/nimbus,jverkoey/nimbus,hanangellove/nimbus,chanffdavid/nimbus,bangquangvn/nimbus,dachaoisme/nimbus,dachaoisme/nimbus,Arcank/nimbus,ycaihua/nimbus,zaichang/nimbus,hanangellove/nimbus,tranhieutt/nimbus,cnbin/nimbus,SuPair/nimbus,LcongGitHub/nimbus,ycaihua/nimbus,dieface/nimbus,michaelShab/nimbus,xiaohongjun0509/nimbus,DreamHill/nimbus,dieface/nimbus,veue/nimbus,michaelShab/nimbus,kviksilver/nimbus,dmishe/nimbus,andaluz/nimbus,michaelShab/nimbus,Guokr1991/nimbus,pilot34/nimbus_fork,bogardon/nimbus,quyixia/nimbus,djMax/nimbus,JyHu/nimbus,mohsinalimat/nimbus,kisekied/nimbus,andaluz/nimbus,LcongGitHub/nimbus,zaichang/nimbus,weiyanwu1984/nimbus,LcongGitHub/nimbus,xiaohongjun0509/nimbus,kviksilver/nimbus,michaelShab/nimbus,liuwu/nimbus,kviksilver/nimbus,zilaiyedaren/nimbus,kisekied/nimbus,kviksilver/nimbus,Arcank/nimbus,weiyanwu1984/nimbus,WeeTom/nimbus,panume/nimbus,marcobgoogle/nimbus,kviksilver/nimbus,bogardon/nimbus,dmishe/nimbus,marcobgoogle/nimbus,JyHu/nimbus,weiyanwu1984/nimbus,mohsinalimat/nimbus,quyixia/nimbus,dachaoisme/nimbus,marcobgoogle/nimbus,kisekied/nimbus,zaichang/nimbus,chanffdavid/nimbus,andaluz/nimbus,tranhieutt/nimbus,SuPair/nimbus,WeeTom/nimbus,bangquangvn/nimbus,Arcank/nimbus,compositeprimes/nimbus,liuwu/nimbus,bogardon/nimbus,pilot34/nimbus_fork,hanangellove/nimbus,veue/nimbus,veue/nimbus,quyixia/nimbus,xiaohongjun0509/nimbus,quyixia/nimbus,SuPair/nimbus,SuPair/nimbus,SuPair/nimbus,dieface/nimbus,JyHu/nimbus,marcobgoogle/nimbus,zilaiyedaren/nimbus,compositeprimes/nimbus,dmishe/nimbus,hanangellove/nimbus,jverkoey/nimbus,mohsinalimat/nimbus,LcongGitHub/nimbus,zilaiyedaren/nimbus,panume/nimbus,bogardon/nimbus,tranhieutt/nimbus,veue/nimbus,DreamHill/nimbus,treejames/nimbus,bangquangvn/nimbus,DreamHill/nimbus,michaelShab/nimbus,mohsinalimat/nimbus,compositeprimes/nimbus,pilot34/nimbus_fork,Arcank/nimbus,chanffdavid/nimbus,dmishe/nimbus,dmishe/nimbus,dieface/nimbus,djMax/nimbus,panume/nimbus,WeeTom/nimbus,xiaohongjun0509/nimbus,tranhieutt/nimbus,zilaiyedaren/nimbus,weiyanwu1984/nimbus,tranhieutt/nimbus,liuwu/nimbus,panume/nimbus,bogardon/nimbus,jverkoey/nimbus,0xced/nimbus,dachaoisme/nimbus,zaichang/nimbus,treejames/nimbus,0xced/nimbus,dachaoisme/nimbus,zilaiyedaren/nimbus,0xced/nimbus,treejames/nimbus,compositeprimes/nimbus,djMax/nimbus,weiyanwu1984/nimbus,compositeprimes/nimbus,pilot34/nimbus_fork,jverkoey/nimbus,quyixia/nimbus,compositeprimes/nimbus,Guokr1991/nimbus,0xced/nimbus,JyHu/nimbus,quyixia/nimbus,Guokr1991/nimbus,pilot34/nimbus_fork,tranhieutt/nimbus,WeeTom/nimbus,treejames/nimbus,LcongGitHub/nimbus,pilot34/nimbus_fork,djMax/nimbus,panume/nimbus,zilaiyedaren/nimbus,hanangellove/nimbus,ycaihua/nimbus,treejames/nimbus,kisekied/nimbus,Guokr1991/nimbus,WeeTom/nimbus,SuPair/nimbus,marcobgoogle/nimbus,cnbin/nimbus,bangquangvn/nimbus,weiyanwu1984/nimbus,bangquangvn/nimbus,WeeTom/nimbus,jverkoey/nimbus,dieface/nimbus,ycaihua/nimbus,cnbin/nimbus,liuwu/nimbus,panume/nimbus,hanangellove/nimbus,marcobgoogle/nimbus,dmishe/nimbus,quyixia/nimbus,pilot34/nimbus_fork,DreamHill/nimbus,JyHu/nimbus,cnbin/nimbus,liuwu/nimbus