🌱 Makefile: refactor how govc is built to workaround dependency issues building govc

[chrischdi]

What this PR does / why we need it:

release-1.6 had dependency issues building the govc binary.

This change adopts the way of building dependant binaries from core CAPI for govc. This method does not have a such issue.

For more information see #1983

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):

Fixes #

Special notes for your reviewer:

Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

Release note:

[chrischdi]

/cherry-pick release-1.7

[k8s-infra-cherrypick-robot]

@chrischdi: once the present PR merges, I will cherry-pick it on top of release-1.7 in a new PR and assign it to you.

In response to this:

/cherry-pick release-1.7

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[chrischdi]

/test pull-cluster-api-provider-vsphere-verify-crds

[randomvariable]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: randomvariable

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [randomvariable]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[k8s-infra-cherrypick-robot]

@chrischdi: #1986 failed to apply on top of branch "release-1.7":

Applying: Makefile: refactor how govc is built to workaround dependency issues building govc
Using index info to reconstruct a base tree...
M	hack/tools/go.mod
M	hack/tools/go.sum
Falling back to patching base and 3-way merge...
Auto-merging hack/tools/go.sum
CONFLICT (content): Merge conflict in hack/tools/go.sum
Auto-merging hack/tools/go.mod
CONFLICT (content): Merge conflict in hack/tools/go.mod
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 Makefile: refactor how govc is built to workaround dependency issues building govc
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherry-pick release-1.7

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[sbueringer]

@chrischdi You'll probably see it anyway, but looks like we need a manual cherry-pick for this one

[chrischdi]

@chrischdi You'll probably see it anyway, but looks like we need a manual cherry-pick for this one

I've just been a minute too late creating the PR 😂