Billy O'Neal aa60b7efa5
[vcpkg] Download vcpkg.exe rather than building it in bootstrap on Windows. (#15474)
This reduces bootstrap cost for Windows customers, resolving the issue initially submitted as #12502 .

The `toolsrc` tree was extracted to https://github.com/microsoft/vcpkg-tool. `bootstrap.sh` was changed to download the right source tarball, extract, and build it. This was chosen over the previous attempt, a submodule, over concerns of accidentally destroying people's local modifications.
2021-02-04 10:15:44 -08:00
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