Make most GLES1 entry points lockless These entry points only set context-local state and thus don't require locking. Bug: angleproject:8224 Change-Id: I80223340348d62a56109324ab3e4f935e53419b3 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4670407 Reviewed-by: Igor Nazarov <i.nazarov@samsung.com> Reviewed-by: Charlie Lao <cclao@google.com> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>