Fix compilation on UWP targets. Bug: angleproject:4053 Change-Id: Iaa358c8ce61d0ebaae11672bfb6dac2d3e847be1 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1881343 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>