Fix Makefile bug for systems without Python.
Fix Makefile bug for systems without Python.

budhrg/minishift,kubernetes/minikube,thatdocslady/minishift,kubernetes/minikube,praveenkumar/minishift,warmchang/minikube,LalatenduMohanty/minishift,warmchang/minikube,minishift/minishift,kubernetes/minikube,jimmidyson/minishift,endocode/minikube,skipjaq/minikube,jimmidyson/minishift,dalehamel/minikube,LalatenduMohanty/minishift,aaron-prindle/minikube,dlorenc/minikube,dlorenc/minikube,dlorenc/minikube,warmchang/minikube,kubernetes/minikube,skipjaq/minikube,mikegrass/minikube,abbytiz/minikube,dongsupark/minikube,r2d4/minikube,thatdocslady/minishift,Preeticp/minishift,dlorenc/minikube,LalatenduMohanty/minishift,dongsupark/minikube,endocode/minikube,dlorenc/minikube,thatdocslady/minishift,dims/minikube,Preeticp/minishift,cu12/minikube,cu12/minikube,dlorenc/minikube,dlorenc/minikube,minishift/minishift,abbytiz/minikube,jimmidyson/minishift,r2d4/minikube,kubernetes/minikube,mikegrass/minikube,dalehamel/minikube,r2d4/minikube,warmchang/minikube,Preeticp/minishift,warmchang/minikube,kubernetes/minikube,dongsupark/minikube,warmchang/minikube,praveenkumar/minishift,warmchang/minikube,cu12/minikube,dlorenc/minikube,kubernetes/minikube,aaron-prindle/minikube,budhrg/minishift,dims/minikube,budhrg/minishift,minishift/minishift,aaron-prindle/minikube,endocode/minikube,mikegrass/minikube,praveenkumar/minishift,skipjaq/minikube,dalehamel/minikube,dims/minikube,abbytiz/minikube