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It only has an effect when not using clang and lld, and the default
build setup is to use clang and lld. Also, goma has dropped support
for non-clang compiles, and a main use case for is_win_fastlink
was being able to use goma. Finally, is_win_fastlink never worked
well.

Bug: 1053958
Change-Id: Ida8079da90157e3f02acf6b056fea3bef667f5bf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2071243
Commit-Queue: Nico Weber <thakis@chromium.org>
Commit-Queue: Hans Wennborg <hans@chromium.org>
Auto-Submit: Nico Weber <thakis@chromium.org>
Reviewed-by: Hans Wennborg <hans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744291}