[vcpkg] Revert change which causes sources to be purged by default in `vcpkg build`#12272

Merged

ras0219-msft merged 1 commit intomicrosoft:masterfrom ras0219:dev/roschuma/revert-default-purge-sources

Jul 6, 2020

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Commits on Jul 5, 2020

[vcpkg] Revert change which causes sources to be purged by default in vcpkg build
ras0219-msft
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