util: disable C4800 warning (bool vs int) on Windows
util: disable C4800 warning (bool vs int) on Windows

Change-Id: I39e0d05e7f0a64cacc04f424a2b83d811a2d67f6
Reviewed-on: https://code-review.googlesource.com/1270
Reviewed-by: Russ Cox <5ad239cb8a44f659eaaee0aa1ea5b94947abe557@swtch.com>

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