clang/win: Don't pass -Wno-inconsistent-missing-override twice.

It's already passed unconditionally everywhere if clang is used, there's
no need to pass it again for clang/win.

BUG=82385,428099

Review URL: https://codereview.chromium.org/1208363002

Cr-Commit-Position: refs/heads/master@{#336431}
2 files changed