Disable 'nodiscard' warning on MSVC for dEQP. Bug: angleproject:4358 Change-Id: I774b4ba442e27935a676f2ce82356e8c77a0db27 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2024334 Commit-Queue: Yuly Novikov <ynovikov@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>