Remove DllMain() from static angle library Bug: chromium:1179061 Change-Id: I89167eb9c6ed244072e00500b47c7df83ac2e80d Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2699188 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Peng Huang <penghuang@chromium.org>