[vswhere.py] Add support for EWDK to the prelude / msvc toolchain

[jrmolin]

Microsoft releases an Enterprise WDK (EWDK) bundle for building drivers and applications without needing a Visual Studio installation. This is very useful for CI builds, where unpacking a zip or mounting an iso file is all that is needed to spin up a build VM, instead of needing to download, install, validate, install WDK, install SDK, repair WDK, etc. Also, there is no license requirement to use the EWDK.

This updates the vswhere.py file to extract the necessary binaries, include dirs, and library dirs from the environment produced by calling the SetupBuildEnv.bat utility in the EWDK. Once this is done, the rest of a buck2 build operates normally.

To use this, download and "install" the EWDK to the filesystem.

> set EWDKDIR=C:\ewdk11
> buck2 build //path/to/target

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[jrmolin]

if https://github.com/facebook/buck2/pull/581 gets merged, I'll need to make some edits.

[KapJI]

@jrmolin Yes, you need to rebase. I tried to make it more compatible with your change.

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@KapJI has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.