Fix warning about class previously declared as struct.
Fix warning about class previously declared as struct.

Reported by clang++.

yannicklm/ninja,iwadon/ninja,bmeurer/ninja,maruel/ninja,juntalis/ninja,mdempsky/ninja,juntalis/ninja,ehird/ninja,mathstuf/ninja,nickhutchinson/ninja,ThiagoGarciaAlves/ninja,vvvrrooomm/ninja,bradking/ninja,PetrWolf/ninja,moroten/ninja,kissthink/ninja,maruel/ninja,juntalis/ninja,ignatenkobrain/ninja,jhanssen/ninja,dorgonman/ninja,bradking/ninja,ukai/ninja,sxlin/dist_ninja,yannicklm/ninja,Qix-/ninja,jimon/ninja,rjogrady/ninja,TheOneRing/ninja,jendrikillner/ninja,rjogrady/ninja,jsternberg/ninja,pathscale/ninja,mutac/ninja,SByer/ninja,juntalis/ninja,ThiagoGarciaAlves/ninja,dpwright/ninja,mgaunard/ninja,mdempsky/ninja,nico/ninja,barak/ninja,nico/ninja,rjogrady/ninja,Maratyszcza/ninja-pypi,dendy/ninja,barak/ninja,fifoforlifo/ninja,hnney/ninja,chenyukang/ninja,dendy/ninja,hnney/ninja,okuoku/ninja,ignatenkobrain/ninja,pck/ninja,ikarienator/ninja,syntheticpp/ninja,metti/ninja,ehird/ninja,tfarina/ninja,bradking/ninja,mohamed/ninja,jsternberg/ninja,sxlin/dist_ninja,mydongistiny/ninja,purcell/ninja,jhanssen/ninja,fifoforlifo/ninja,synaptek/ninja,moroten/ninja,jendrikillner/ninja,sxlin/dist_ninja,mutac/ninja,ctiller/ninja,dpwright/ninja,moroten/ninja,LuaDist/ninja,guiquanz/ninja,fuchsia-mirror/third_party-ninja,Ju2ender/ninja,PetrWolf/ninja,nickhutchinson/ninja,bradking/ninja,ignatenkobrain/ninja,barak/ninja,tychoish/ninja,nornagon/ninja,lizh06/ninja,dorgonman/ninja,TheOneRing/ninja,autopulated/ninja,mydongistiny/ninja,TheOneRing/ninja,guiquanz/ninja,mgaunard/ninja,mathstuf/ninja,mohamed/ninja,jsternberg/ninja,fuchsia-mirror/third_party-ninja,ehird/ninja,sgraham/ninja,jsternberg/ninja,nafest/ninja,sgraham/ninja,mathstuf/ninja,Ju2ender/ninja,ukai/ninja,glensc/ninja,pck/ninja,kissthink/ninja,kimgr/ninja,okuoku/ninja,ctiller/ninja,AoD314/ninja,Qix-/ninja,bmeurer/ninja,glensc/ninja,Maratyszcza/ninja-pypi,ilor/ninja,martine/ninja,AoD314/ninja,okuoku/ninja,AoD314/ninja,drbo/ninja,ctiller/ninja,mutac/ninja,TheOneRing/ninja,iwadon/ninja,sgraham/ninja,ctiller/ninja,drbo/ninja,iwadon/ninja,mohamed/ninja,ndsol/subninja,lizh06/ninja,nico/ninja,maruel/ninja,metti/ninja,bmeurer/ninja,nico/ninja,ehird/ninja,pathscale/ninja,guiquanz/ninja,colincross/ninja,sorbits/ninja,mutac/ninja,colincross/ninja,atetubou/ninja,dabrahams/ninja,kissthink/ninja,LuaDist/ninja,ninja-build/ninja,SByer/ninja,ninja-build/ninja,ikarienator/ninja,ilor/ninja,barak/ninja,tfarina/ninja,dendy/ninja,ukai/ninja,jhanssen/ninja,PetrWolf/ninja,okuoku/ninja,PetrWolf/ninja,sxlin/dist_ninja,ukai/ninja,PetrWolf/ninja-main,pathscale/ninja,ilor/ninja,jimon/ninja,rnk/ninja,rnk/ninja,automeka/ninja,dpwright/ninja,dpwright/ninja,atetubou/ninja,nafest/ninja,ndsol/subninja,sxlin/dist_ninja,colincross/ninja,ninja-build/ninja,colincross/ninja,syntheticpp/ninja,ikarienator/ninja,automeka/ninja,vvvrrooomm/ninja,ndsol/subninja,nickhutchinson/ninja,ThiagoGarciaAlves/ninja,kimgr/ninja,jimon/ninja,automeka/ninja,autopulated/ninja,tychoish/ninja,mydongistiny/ninja,nocnokneo/ninja,curinir/ninja,autopulated/ninja,liukd/ninja,kimgr/ninja,synaptek/ninja,nornagon/ninja,nicolasdespres/ninja,dorgonman/ninja,purcell/ninja,lizh06/ninja,sgraham/ninja,liukd/ninja,chenyukang/ninja,Maratyszcza/ninja-pypi,atetubou/ninja,jendrikillner/ninja,glensc/ninja,ilor/ninja,moroten/ninja,vvvrrooomm/ninja,nocnokneo/ninja,martine/ninja,nickhutchinson/ninja,fuchsia-mirror/third_party-ninja,sxlin/dist_ninja,syntheticpp/ninja,pck/ninja,pck/ninja,kimgr/ninja,SByer/ninja,dabrahams/ninja,synaptek/ninja,mgaunard/ninja,metti/ninja,purcell/ninja,rnk/ninja,ThiagoGarciaAlves/ninja,dorgonman/ninja,martine/ninja,atetubou/ninja,maximuska/ninja,ignatenkobrain/ninja,fuchsia-mirror/third_party-ninja,maruel/ninja,rnk/ninja,nafest/ninja,fifoforlifo/ninja,curinir/ninja,nicolasdespres/ninja,LuaDist/ninja,liukd/ninja,chenyukang/ninja,lizh06/ninja,mydongistiny/ninja,PetrWolf/ninja-main,bmeurer/ninja,maximuska/ninja,purcell/ninja,rjogrady/ninja,syntheticpp/ninja,curinir/ninja,iwadon/ninja,nornagon/ninja,Maratyszcza/ninja-pypi,nicolasdespres/ninja,Ju2ender/ninja,liukd/ninja,drbo/ninja,tychoish/ninja,PetrWolf/ninja-main,sorbits/ninja,synaptek/ninja,ikarienator/ninja,SByer/ninja,martine/ninja,LuaDist/ninja,dendy/ninja,tychoish/ninja,maximuska/ninja,kissthink/ninja,sorbits/ninja,PetrWolf/ninja-main,chenyukang/ninja,Ju2ender/ninja,ninja-build/ninja,mathstuf/ninja,Qix-/ninja,jimon/ninja,curinir/ninja,Qix-/ninja,dabrahams/ninja,nicolasdespres/ninja,autopulated/ninja,pathscale/ninja,mdempsky/ninja,nornagon/ninja,AoD314/ninja,ndsol/subninja,mohamed/ninja,fifoforlifo/ninja,maximuska/ninja,glensc/ninja,dabrahams/ninja,tfarina/ninja,yannicklm/ninja,hnney/ninja,jhanssen/ninja,automeka/ninja,vvvrrooomm/ninja,mdempsky/ninja,nafest/ninja,tfarina/ninja,sorbits/ninja,jendrikillner/ninja,hnney/ninja,mgaunard/ninja,metti/ninja,sxlin/dist_ninja,guiquanz/ninja,yannicklm/ninja,nocnokneo/ninja,drbo/ninja,nocnokneo/ninja