alloca fix to allow Clang with Microsoft CodeGen path
alloca fix to allow Clang with Microsoft CodeGen path

wflohry/imgui-addons,ggtucker/imgui,burningreggae/imgui,ggtucker/imgui,Flix01/imgui,cmaughan/imgui,burningreggae/imgui,nProtect/imgui,cmaughan/imgui,ocornut/imgui,bkaradzic/imgui,dougbinks/imgui,wflohry/imgui-addons,ocornut/imgui,bkaradzic/imgui,cmaughan/imgui,ggtucker/imgui,mikesart/imgui,bkaradzic/imgui,Flix01/imgui,ocornut/imgui,cmaughan/imgui,nProtect/imgui,dougbinks/imgui,mikesart/imgui,nProtect/imgui,aimotive/imgui-glfw,Flix01/imgui,aimotive/imgui-glfw