Keep the configured event log `MaxSize` as a capacity limit and track the
physical file size separately.
New logs now start at the Windows 64 KiB file-size granularity, instead of
growing immediately to the full configured maximum. They are then grown in
64 KiB chunks as records are written, while preserving the logical used area
in the header offsets and EOF record.
Hermès Bélusca-Maïto