Fix compile warning in thread_status_util.h on Mac
Fix compile warning in thread_status_util.h on Mac

Summary:
Fix compile warning in thread_status_util.h on Mac

Test Plan:
make dbg -j32

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