On some Windows systems aclayers.dll gets injected into the process and brings in a lot of extra dlls.

There can be some default 'I' extended file attribute pertaining to
non-indexable file/folders by Indexing Service, e.g. when using CIFS.

This fixes a regression introduced in 6b64e009.

It doesn't really work, and trying to make multisampling work with onscreen
rendering is probably more trouble than it's worth, both for us and the
driver.