Delete the Windows storage driver?

[mtrmac]

Ever since 1eba391bd3cde8005087b661a2f07e803ecba390 in Sep 2017 the driver’s test can’t compile because a addAceToSddlDacl function is missing.

Clearly no-one is even trying to make it functional.

Can we remove that code? If we ever did want to add a Windows support, the old code can always be fished out of git.