Add dynamic option for nomad

[ProbablyRusty]

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• Add option “with-dynamic” to nomad, in order to optionally build with CGO_ENABLED
• This is a common use case for some VPN users on Mac OS X
• See: Add dynamic option for vault #7238

[MikeMcQuaid]

See #7238 (comment)

[ProbablyRusty]

@MikeMcQuaid in light of #7238 can we remove Do Not Merge on this as well?

[MikeMcQuaid]

@BrewTestBot test this please

[MikeMcQuaid]

Thanks for your contribution to Homebrew! Without people like you submitting PRs we couldn't run this project. You rock!

For future reference the preferred commit message format is nomad: add dynamic option.. Please complete the issue template in future PRs where this format is detailed in the linked Contributing guidelines. Thanks!