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Instead, use -imsvc and the hermetic toolchain for the preprocessor, and
don't look in system include dirs for resources.

This means we can't include resources from the system include dirs,
but we don't want to do that anyways.

For now, keep using tool_wrapper to set the env so that we can
find MS rc.exe on %PATH%.

Bug: none
Change-Id: I1065be2513659c6eb5b4de440299fa86cfb58736
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1863149Reviewed-by: Hans Wennborg <hans@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706916}