LogAssetRegistry Error produces a path error when referring to assets on a junction/hard link/soft link

IAssetRegistry::GetChecked().ScanPathsSynchronous() now eventually calls FPathExistence::LoadExistenceData
and logs the error

FPathExistence failed to gather correct capitalization from disk for <path>, because GetFilenameOnDisk returned a non-matching filename.

This doesn't handle junctions; in one project audio & localization data is not stored in perforce, it's downloaded and mounted as a UGS post sync step:

LocalAbsPath = <root>/<project>/Content/Sound 
CorrectedCapitalization = <root>/<project>/LocAudioDepot/Sound

Mount a subdirectory in the content directory of a content used by the game as a junction on disk.

mklink /J <ProjectRoot>/Content/LocAudioDepot d:\scratch\DownloadedAudioContent

Error will be given in editor and cookcommandlet startup when data from /Game/LocAudioDepot is scanned.