Relative paths in RetroArch playlists cause mounting to fail

[Svipur]

This seems to be true for playlist entries linking directly to mounts like HDI/FDI/etc.

E,g, having a playlist entry with a path like ..\Games\PC98\Game.hdi results in the core starting up with no active mounts and with the 'Number of files' prompt.

Using absolute paths like D:\Games\PC98\Game.hdi works just fine, with the game booting up successfully.

Using a CMD file with a relative path like ..\Games\PC98\Game.cmd (which subsequently links to the same HDI file with 'np2kai Game.hdi') also works just fine.