fix: Makefile OS conditional

[btiernay]

Fixes Makefile OS conditional preventing build on MacOS for #752.

[linux-foundation-easycla]

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• ✅ login: btiernay / name: Bob Tiernay (c27b4be)

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[k8s-ci-robot]

Hi @btiernay. Thanks for your PR.

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[btiernay]

@mmiranda96 Any chance you would be so kind as to review this little PR? 🙏

[mmiranda96]

/ok-to-test

[mmiranda96]

/lgtm
/assign @vteratipally

Thanks for the fix @btiernay!

[btiernay]

@vteratipally @Random-Liu Any chance you have some time to review this PR?🙏

Thank you kindly in advance.

[vteratipally]

/lgtm
/approve

Thank you for the fix @btiernay

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: btiernay, mmiranda96, vteratipally

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