fix minor clang-x64 warnings
fix minor clang-x64 warnings

fixes #265
bagobor/imgui,luiseduardohdbackup/imgui,wflohry/imgui-addons,seanmiddleditch/imgui,rmoorman/imgui,thevaber/imgui,rxantos/imgui,mikesart/imgui,elect86/imgui,cmaughan/imgui,luiseduardohdbackup/imgui,benoitjacquier/imgui,thevaber/imgui,nmlgc/imgui,aimotive/imgui-glfw,seanmiddleditch/imgui,dougbinks/imgui,bkaradzic/imgui,kylawl/imgui,aimotive/imgui-glfw,xythobuz/imgui,gyakoo/imgui,cmaughan/imgui,andresv/imgui,usagi/imguixx,twigletguy/imgui,xythobuz/imgui,cmaughan/imgui,bkaradzic/imgui,wasikuss/imgui,wflohry/imgui-addons,nmlgc/imgui,bkaradzic/imgui,tpoechtrager/imgui,sakishum/imgui,nProtect/imgui,ggtucker/imgui,elect86/imgui,zho7611/imgui,wangshijin/imgui,nProtect/imgui,usagi/imguixx,shaggytwodope/imgui,neshume/imgui,wasikuss/imgui,emoon/imgui,ocornut/imgui,ggtucker/imgui,ocornut/imgui,Flix01/imgui,thennequin/imgui,ocornut/imgui,gyakoo/imgui,wangshijin/imgui,rxantos/imgui,dougbinks/imgui,cmaughan/imgui,GHF/imgui,mikesart/imgui,zho7611/imgui,sakishum/imgui,rmoorman/imgui,kylawl/imgui,xunmengfeng/imgui,ghassanpl/imgui,Psybrus/imgui,twigletguy/imgui,bagobor/imgui,burningreggae/imgui,redblobgames/imgui,ghassanpl/imgui,tom-seddon/imgui,Pagghiu/imgui,Pagghiu/imgui,andresv/imgui,thennequin/imgui,benoitjacquier/imgui,tom-seddon/imgui,Psybrus/imgui,redblobgames/imgui,burningreggae/imgui,nProtect/imgui,shaggytwodope/imgui,xunmengfeng/imgui,tpoechtrager/imgui,emoon/imgui,ggtucker/imgui,Flix01/imgui,Flix01/imgui,GHF/imgui,neshume/imgui