build: fixed build warning
build: fixed build warning

to clear warning and ensure git sha linkage works in the future

Fixes #3406

ravigadde/etcd,dannysauer/etcd,coreos/etcd,a-robinson/etcd,mickep76/etcd,giantswarm/etcd,arthurcolle/etcd,cchamplin/etcd,ktateish/etcd,rchicoli/etcd,improbable-io/etcd,gyuho/etcd,glycerine/etcd,westhood/etcd,handsomesun/etcd,YuleiXiao/etcd,ajityagaty/etcd,chenbaihu/etcd,Yhgenomics/etcd,mkumatag/etcd,linuxcer/etcd,jchauncey/etcd,chipironcin/etcd,visheshnp/etcd,xiang90/etcd,hongchaodeng/etcd,gityf/etcd,akauppi/etcd,delkyd/etcd,oscarrr110/etcd,jlamillan/etcd,buaazp/etcd,Winslett/etcd,etcd-io/etcd,mickep76/etcd,zaphod-concur/etcd,jeremyeder/etcd,swingbach/etcd,qqsun8819/etcd,msanterre/etcd,hroyrh/etcd,fanminshi/etcd,shawnps/etcd,delkyd/etcd,ktateish/etcd,CrazyJvm/etcd,lorneli/etcd,gyuho/etcd,tguangch/etcd,msanterre/etcd,combk8s/etcd,siddontang/etcd,dnaeon/etcd,Eagle-X/etcd,honeyqa/etcd,chipironcin/etcd,etcd-io/etcd,xdlinear/etcd,glevand/coreos--etcd,nekto0n/etcd,svdata/etcd,ajityagaty/etcd,westhood/etcd,TheHippo/etcd,vimalk78/etcd,sofuture/etcd,rnaveiras/etcd,xdlinear/etcd,fasaxc/etcd,rnaveiras/etcd,chenbaihu/etcd,bdarnell/etcd,li-ang/etcd,Yhgenomics/etcd,handsomesun/etcd,insequent/etcd,betawaffle/etcd,glevand/coreos--etcd,bluebreezecf/etcd,li-ang/etcd,nekto0n/etcd,onlyjob/etcd,tamird/etcd,sofuture/etcd,swingbach/etcd,visheshnp/etcd,arthurcolle/etcd,oscarrr110/etcd,joshix/etcd,yudai/etcd,armstrongli/etcd,Winslett/etcd,ravigadde/etcd,vimalk78/etcd,dannysauer/etcd,svdata/etcd,mqliang/etcd,bdarnell/etcd,rnaveiras/etcd,sinsharat/etcd,improbable-io/etcd,coreos/etcd,whuwxl/etcd,jchauncey/etcd,honeyqa/etcd,hroyrh/etcd,sinsharat/etcd,armstrongli/etcd,endocode/etcd,Timer/etcd,StorReduce/etcd,achanda/etcd,raoofm/etcd,onlyjob/etcd,combk8s/etcd,jonboulle/etcd,iamqizhao/etcd,wantonsolutions/dinv-etcd,etcd-io/etcd,luxas/etcd,cockroachdb/etcd,beni55/etcd,linuxcer/etcd,jeremyeder/etcd,sebrandon1/etcd,purpleidea/etcd,buaazp/etcd,hongchaodeng/etcd,sebrandon1/etcd,jefby/etcd,wantonsolutions/dinv-etcd,fgbreel/etcd,rchicoli/etcd,sayden/etcd,jlamillan/etcd,dnaeon/etcd,gae123/etcd,fasaxc/etcd,wowsoso/etcd,hongbinz/etcd,akauppi/etcd,gouyang/etcd,beni55/etcd,sayden/etcd,xychu/etcd,siddontang/etcd,wantonsolutions/dinv-etcd,plasticbox/etcd,qqsun8819/etcd,mkumatag/etcd,yudai/etcd,StorReduce/etcd,glycerine/etcd,fanminshi/etcd,lumjjb/etcd,endocode/etcd,jonboulle/etcd,kkaneda/etcd,asim/etcd,fasaxc/etcd,mike-lerch/etcd,raoofm/etcd,jefby/etcd,plasticbox/etcd,OyTao/etcd_learning,ajityagaty/etcd,xiang90/etcd,xychu/etcd,joshix/etcd,shawnps/etcd,fgbreel/etcd,asim/etcd,mqliang/etcd,mike-lerch/etcd,heyitsanthony/etcd,lorneli/etcd,giantswarm/etcd,luxas/etcd,YuleiXiao/etcd,hongbinz/etcd,gae123/etcd,HideoYamauchi/etcd,wowsoso/etcd,insequent/etcd,tguangch/etcd,mkumatag/etcd,lumjjb/etcd,yichengq/etcd,pauldallen/etcd,Eagle-X/etcd,OyTao/etcd_learning,TheHippo/etcd,yichengq/etcd,gouyang/etcd,pauldallen/etcd,gityf/etcd,cockroachdb/etcd,kkaneda/etcd,whuwxl/etcd,betawaffle/etcd,Timer/etcd,HideoYamauchi/etcd,CrazyJvm/etcd,achanda/etcd,zaphod-concur/etcd,purpleidea/etcd,a-robinson/etcd,tamird/etcd,iamqizhao/etcd,bluebreezecf/etcd,cchamplin/etcd,heyitsanthony/etcd,mqliang/etcd