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this allows flagging the code with -msse4.1; fixes a build failure with
clang-cl as for msvc builds sse4 support is assumed, but clang-cl
requires the -m flag to enable it.

Bug: 1151489
Change-Id: I3d29e5c3d4985b76ad44e9ca15886c0428c5c140
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2561030
Commit-Queue: James Zern <jzern@google.com>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832690}