Fix snprintf and vsnprintf definition inconsistencies.
Fix snprintf and vsnprintf definition inconsistencies.

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