Makefile: clean up static/nonstatic build output

[thockin]

Slightly nicer output when building

before:

$ make generated_files
+++ [0226 13:42:17] Building go targets for linux/amd64:
    hack/make-rules/helpers/go2make
> non-static build: k8s.io/kubernetes/hack/make-rules/helpers/go2make

after:

$ make generated_files
+++ [0226 14:30:08] Building go targets for linux/amd64
    k8s.io/kubernetes/hack/make-rules/helpers/go2make (non-static)

or:

$ make all WHAT="cmd/kubectl test/e2e/e2e.test vendor/github.com/onsi/ginkgo/ginkgo"
+++ [0227 10:30:27] Building go targets for linux/amd64
    k8s.io/kubernetes/hack/make-rules/helpers/go2make (non-static)
+++ [0227 10:30:31] Building go targets for linux/amd64
    k8s.io/kubernetes/cmd/kubectl (static)
    k8s.io/kubernetes/test/e2e/e2e.test (test)
    k8s.io/kubernetes/vendor/github.com/onsi/ginkgo/ginkgo (non-static)

The "Building go targets..." lines are once per invocation of build.sh. I don't love it but it's better than before? TGhe alternative would be to emit one "Building go target" for each target, but we don't call go build once per binary, so the timestamps are kind of a lie.

/kind cleanup

NONE

[k8s-ci-robot]

@thockin: This issue is currently awaiting triage.

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[dims]

/retest

[dims]

/approve
/lgtm

[k8s-ci-robot]

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