Fix missing include on some systems to use intptr_t. (#2036, #2054)
Fix missing include on some systems to use intptr_t. (#2036, #2054)

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