Unbreak win/CFI builds after https://chromium-review.googlesource.com/c/chromium/src/+/941905

`clang-cl /Brepro -flto=thin` causes:

    warning: argument unused during compilation: '-mno-incremental-linker-compatible'

because /Brepro is a built-in assembler flag, which isn't used in LTO builds.

(We have an open bug on clang-cl somewhere to print the original spelling of
aliased flags.)

Bug: 330260
Change-Id: I72c6fb496107a7c937019293e6ad6f749a680a20
Reviewed-on: https://chromium-review.googlesource.com/944003
Reviewed-by: Hans Wennborg <hans@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#540285}
1 file changed