gn: Don't build sse3 code in skia with -msse4.1.
gn: Don't build sse3 code in skia with -msse4.1.

Else the compiler can create SSE4.1 instructions for the SSE3 files, but we
only check for SSE3 when running that code.  So the code might crash with
"unknown instruction" when running on a processor that has SSE3 but not SSE4.

This matches what the gyp build does.

Depends on https://codereview.chromium.org/1161853008/

BUG=496512

Review URL: https://codereview.chromium.org/1160253011

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#333171}

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