Update lib/filecache.php

related to issue #982:

OC_FileCache::increaseSize needs to normalize the path.
If the path is not normalized the traversal through the directory tree does not stop at correctly at the root (at least on Windows).

This fixes the upload progress spinner spinning forever.
Merge branch 'patch-5' of https://github.com/irgsmirx/owncloud-sqlserver into patch-5