Sean Warren 17623739df [toolsrc] Optionally allow vcpkg to clean after each build (#6522)
* [toolsrc] Optionally allow vcpkg to clean packages, buildtrees and downloads after each build
Adds switch --clean-after-build

* [toolsrc] Clarify that --clean-after-build deletes downloads

* [toolsrc] Revert changes to ci download caching behaviour
2019-05-23 11:24:02 -07:00
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