[Tilesathome] Temporary workaround for Windows Bug

[Carsten Moeller]

Hey Spaetz,

as long as we have not found the Windows bug
---
Everything is Ok
cannot remove directory for 
C:\OSM\tilesAtHome\stable\tilesAtLocal\temp\tile_12_2167_1325.dir: Permi
ssion denied at Compress.pm line 119
---
we should have a workaround for it.
With every roundtrip the upload procedure compresses all the 
.dir-Directories, regardless of they are empty from previous call
or not. If this was fixed in any way I would dare leaving my machine 
render in a loop.

Regards

Carsten