Build fix for master.
Build fix for master.

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