Rename functions that overlap with Windows APIs. Bug: angleproject:6283 Change-Id: Ifcd9ea9e3bf729fd2066178eb9429050b2f10518 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3212894 Reviewed-by: Bruce Dawson <brucedawson@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>