egl/wgl: Fix some awkward sizeof formatting
Fixes: 3415bf02 ("egl: Add a basic Windows driver") Suggested-by:Mike Blumenkrantz <michael.blumenkrantz@gmail.com> Acked-by:
Daniel Stone <daniels@collabora.com> Acked-by:
Mike Blumenkrantz <michael.blumenkrantz@gmail.com> Acked-by:
Sidney Just <justsid@x-plane.com> Acked-by:
Jason Ekstrand <jason.ekstrand@collabora.com> Part-of: <mesa/mesa!12964>