fix clang compilation
fix clang compilation

Summary:
as title

luckywhu/rocksdb,virtdb/rocksdb,ylong/rocksdb,NickCis/rocksdb,sorphi/rocksdb,rDSN-Projects/rocksdb.replicated,OverlordQ/rocksdb,flabby/rocksdb,JohnPJenkins/rocksdb,facebook/rocksdb,siddhartharay007/rocksdb,zhangpng/rocksdb,vashstorm/rocksdb,JoeWoo/rocksdb,wenduo/rocksdb,tsheasha/rocksdb,vmx/rocksdb,Andymic/rocksdb,dkorolev/rocksdb,temicai/rocksdb,wat-ze-hex/rocksdb,SunguckLee/RocksDB,ryneli/rocksdb,kaschaeffer/rocksdb,fengshao0907/rocksdb,JohnPJenkins/rocksdb,makelivedotnet/rocksdb,alihalabyah/rocksdb,NickCis/rocksdb,IMCG/RcoksDB,zhangpng/rocksdb,wlqGit/rocksdb,biddyweb/rocksdb,JohnPJenkins/rocksdb,wlqGit/rocksdb,temicai/rocksdb,flabby/rocksdb,zhangpng/rocksdb,SunguckLee/RocksDB,tsheasha/rocksdb,rDSN-Projects/rocksdb.replicated,alihalabyah/rocksdb,biddyweb/rocksdb,makelivedotnet/rocksdb,dkorolev/rocksdb,RyanTech/rocksdb,wat-ze-hex/rocksdb,flabby/rocksdb,sorphi/rocksdb,fengshao0907/rocksdb,jalexanderqed/rocksdb,anagav/rocksdb,ylong/rocksdb,facebook/rocksdb,dkorolev/rocksdb,NickCis/rocksdb,OverlordQ/rocksdb,SunguckLee/RocksDB,kaschaeffer/rocksdb,wenduo/rocksdb,makelivedotnet/rocksdb,vmx/rocksdb,makelivedotnet/rocksdb,geraldoandradee/rocksdb,norton/rocksdb,Applied-Duality/rocksdb,rDSN-Projects/rocksdb.replicated,wskplho/rocksdb,kaschaeffer/rocksdb,JoeWoo/rocksdb,hobinyoon/rocksdb,wat-ze-hex/rocksdb,facebook/rocksdb,OverlordQ/rocksdb,caijieming-baidu/rocksdb,skunkwerks/rocksdb,wat-ze-hex/rocksdb,vashstorm/rocksdb,lgscofield/rocksdb,dkorolev/rocksdb,bbiao/rocksdb,Vaisman/rocksdb,Vaisman/rocksdb,wenduo/rocksdb,wskplho/rocksdb,biddyweb/rocksdb,amyvmiwei/rocksdb,JackLian/rocksdb,ylong/rocksdb,caijieming-baidu/rocksdb,skunkwerks/rocksdb,biddyweb/rocksdb,mbarbon/rocksdb,norton/rocksdb,norton/rocksdb,virtdb/rocksdb,Andymic/rocksdb,skunkwerks/rocksdb,caijieming-baidu/rocksdb,mbarbon/rocksdb,lgscofield/rocksdb,zhangpng/rocksdb,skunkwerks/rocksdb,ylong/rocksdb,fengshao0907/rocksdb,lgscofield/rocksdb,fengshao0907/rocksdb,norton/rocksdb,OverlordQ/rocksdb,RyanTech/rocksdb,Vaisman/rocksdb,luckywhu/rocksdb,wlqGit/rocksdb,vmx/rocksdb,IMCG/RcoksDB,ryneli/rocksdb,skunkwerks/rocksdb,rDSN-Projects/rocksdb.replicated,hobinyoon/rocksdb,facebook/rocksdb,amyvmiwei/rocksdb,JohnPJenkins/rocksdb,NickCis/rocksdb,vmx/rocksdb,siddhartharay007/rocksdb,jalexanderqed/rocksdb,hobinyoon/rocksdb,JohnPJenkins/rocksdb,geraldoandradee/rocksdb,IMCG/RcoksDB,biddyweb/rocksdb,wskplho/rocksdb,virtdb/rocksdb,wskplho/rocksdb,norton/rocksdb,SunguckLee/RocksDB,bbiao/rocksdb,ylong/rocksdb,tizzybec/rocksdb,amyvmiwei/rocksdb,tsheasha/rocksdb,alihalabyah/rocksdb,JackLian/rocksdb,Andymic/rocksdb,Andymic/rocksdb,dkorolev/rocksdb,jalexanderqed/rocksdb,wenduo/rocksdb,OverlordQ/rocksdb,tsheasha/rocksdb,anagav/rocksdb,kaschaeffer/rocksdb,temicai/rocksdb,virtdb/rocksdb,hobinyoon/rocksdb,wlqGit/rocksdb,wenduo/rocksdb,vmx/rocksdb,Andymic/rocksdb,rDSN-Projects/rocksdb.replicated,RyanTech/rocksdb,siddhartharay007/rocksdb,Applied-Duality/rocksdb,facebook/rocksdb,SunguckLee/RocksDB,NickCis/rocksdb,RyanTech/rocksdb,amyvmiwei/rocksdb,norton/rocksdb,wskplho/rocksdb,anagav/rocksdb,NickCis/rocksdb,temicai/rocksdb,wat-ze-hex/rocksdb,tizzybec/rocksdb,ylong/rocksdb,flabby/rocksdb,lgscofield/rocksdb,ryneli/rocksdb,vashstorm/rocksdb,wskplho/rocksdb,tsheasha/rocksdb,hobinyoon/rocksdb,fengshao0907/rocksdb,jalexanderqed/rocksdb,flabby/rocksdb,IMCG/RcoksDB,alihalabyah/rocksdb,JoeWoo/rocksdb,Applied-Duality/rocksdb,ryneli/rocksdb,flabby/rocksdb,siddhartharay007/rocksdb,bbiao/rocksdb,Vaisman/rocksdb,hobinyoon/rocksdb,luckywhu/rocksdb,RyanTech/rocksdb,hobinyoon/rocksdb,flabby/rocksdb,mbarbon/rocksdb,mbarbon/rocksdb,biddyweb/rocksdb,wlqGit/rocksdb,Applied-Duality/rocksdb,bbiao/rocksdb,ylong/rocksdb,mbarbon/rocksdb,JoeWoo/rocksdb,vashstorm/rocksdb,tsheasha/rocksdb,virtdb/rocksdb,luckywhu/rocksdb,caijieming-baidu/rocksdb,OverlordQ/rocksdb,dkorolev/rocksdb,Andymic/rocksdb,virtdb/rocksdb,tizzybec/rocksdb,amyvmiwei/rocksdb,JohnPJenkins/rocksdb,wenduo/rocksdb,bbiao/rocksdb,luckywhu/rocksdb,mbarbon/rocksdb,Andymic/rocksdb,skunkwerks/rocksdb,sorphi/rocksdb,anagav/rocksdb,bbiao/rocksdb,norton/rocksdb,caijieming-baidu/rocksdb,JackLian/rocksdb,amyvmiwei/rocksdb,ryneli/rocksdb,makelivedotnet/rocksdb,lgscofield/rocksdb,sorphi/rocksdb,hobinyoon/rocksdb,facebook/rocksdb,wat-ze-hex/rocksdb,bbiao/rocksdb,RyanTech/rocksdb,JoeWoo/rocksdb,facebook/rocksdb,temicai/rocksdb,temicai/rocksdb,tizzybec/rocksdb,luckywhu/rocksdb,wenduo/rocksdb,Vaisman/rocksdb,tizzybec/rocksdb,jalexanderqed/rocksdb,JackLian/rocksdb,makelivedotnet/rocksdb,jalexanderqed/rocksdb,geraldoandradee/rocksdb,ryneli/rocksdb,makelivedotnet/rocksdb,NickCis/rocksdb,anagav/rocksdb,caijieming-baidu/rocksdb,JackLian/rocksdb,vashstorm/rocksdb,Vaisman/rocksdb,IMCG/RcoksDB,wlqGit/rocksdb,wenduo/rocksdb,vmx/rocksdb,luckywhu/rocksdb,Andymic/rocksdb,anagav/rocksdb,Applied-Duality/rocksdb,kaschaeffer/rocksdb,virtdb/rocksdb,sorphi/rocksdb,geraldoandradee/rocksdb,Vaisman/rocksdb,geraldoandradee/rocksdb,Applied-Duality/rocksdb,JackLian/rocksdb,amyvmiwei/rocksdb,wat-ze-hex/rocksdb,SunguckLee/RocksDB,wlqGit/rocksdb,geraldoandradee/rocksdb,siddhartharay007/rocksdb,tsheasha/rocksdb,tsheasha/rocksdb,geraldoandradee/rocksdb,zhangpng/rocksdb,wskplho/rocksdb,zhangpng/rocksdb,JoeWoo/rocksdb,alihalabyah/rocksdb,vmx/rocksdb,dkorolev/rocksdb,kaschaeffer/rocksdb,lgscofield/rocksdb,tizzybec/rocksdb,vmx/rocksdb,Applied-Duality/rocksdb,sorphi/rocksdb,tizzybec/rocksdb,alihalabyah/rocksdb,sorphi/rocksdb,temicai/rocksdb,mbarbon/rocksdb,RyanTech/rocksdb,caijieming-baidu/rocksdb,vashstorm/rocksdb,anagav/rocksdb,OverlordQ/rocksdb,rDSN-Projects/rocksdb.replicated,vashstorm/rocksdb,IMCG/RcoksDB,siddhartharay007/rocksdb,facebook/rocksdb,bbiao/rocksdb,zhangpng/rocksdb,JohnPJenkins/rocksdb,alihalabyah/rocksdb,wat-ze-hex/rocksdb,IMCG/RcoksDB,biddyweb/rocksdb,lgscofield/rocksdb,siddhartharay007/rocksdb,kaschaeffer/rocksdb,norton/rocksdb,fengshao0907/rocksdb,JackLian/rocksdb,ryneli/rocksdb,fengshao0907/rocksdb,skunkwerks/rocksdb,JoeWoo/rocksdb,rDSN-Projects/rocksdb.replicated,SunguckLee/RocksDB,SunguckLee/RocksDB,jalexanderqed/rocksdb