[vcpkg] Allow compilation of HEAD_REF-only ports in manifest mode#16613

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PazerOP wants to merge 1 commit intomicrosoft:masterfrom

PazerOP:head_fallback_on_manifests

Commits on Mar 9, 2021

If we're on manifest mode (no way to specify --head or other package-specific options), and a package requires --head, choose the head ref automatically.
PazerOP
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