update HYPERKIT_BUILD_IMAGE to Go 1.17

Makefile

@@ -52,7 +52,7 @@ REGISTRY ?= gcr.io/k8s-minikube
 COMMIT_NO := $(shell git rev-parse HEAD 2> /dev/null || true)
 COMMIT ?= $(if $(shell git status --porcelain --untracked-files=no),"${COMMIT_NO}-dirty","${COMMIT_NO}")
 COMMIT_SHORT = $(shell git rev-parse --short HEAD 2> /dev/null || true)
-HYPERKIT_BUILD_IMAGE 	?= neilotoole/xcgo:go1.15
+HYPERKIT_BUILD_IMAGE ?= gcr.io/k8s-minikube/xcgo:go1.17
 
 # NOTE: "latest" as of 2021-02-06. kube-cross images aren't updated as often as Kubernetes
 # https://github.com/kubernetes/kubernetes/blob/master/build/build-image/cross/VERSION