[SAC] Disk space taken by osgeo downloads

I took a look at upload.osgeo.org after reading it had some
problems with disk filling up.

The top 5 space-takers under /osgeo/download are:

  29484876 osgeo4w (29G)
  23485252 ossim
  18829316 mapguide
  16950772 qgis
   7522648 webdav (7.2G)

Total space taken by /osgeo/download is 126G.
Device space taken is 134G over 149G available.
7.7GB are left.