Arsen Tufankjian 644ba5d998
[vcpkg] Adding support for finding VS2019 by environment variable (#10760)
* Fixing build with VS2019

* Added support for finding VS2019 by VS160COMNTOOLS env var

* [vcpkg] Explicitly handle trailing backslash in VS140 path.

* [vcpkg] Defer instance validation for VS160COMNTOOLS

Co-authored-by: Robert Schumacher <roschuma@microsoft.com>
2020-05-08 12:43:30 -07:00
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