Correct windows build flags for clang-cl/msvc-cl under opt/fastbuild/dbg#13133

Merged

lizan merged 10 commits intoenvoyproxy:masterfrom

greenhouse-org:fix-windows-fastbuild-default

Oct 11, 2020

Commits on Oct 2, 2020

Draft changes to better support -c fastbuild on Windows

wrowe
and
sunjayBhatia
committed

Commits on Oct 6, 2020

Merge remote-tracking branch 'origin/master' into fix-windows-fastbuild-default
wrowe
committed
Confirm redundant toggle, document issue/workaround
wrowe
committed

Commits on Oct 8, 2020