Enable build scripts to know if we are in manifest mode#24

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PazerOP wants to merge 1 commit intomicrosoft:mainfrom

PazerOP:head_fallback_on_manifest

Commits on Mar 9, 2021

To support PazerOP/vcpkg/head_fallback_on_manifest, we need to know in the build scripts if vcpkg is in manifest mode.
PazerOP
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