client: xtfsutil + xtfsutil_server.cpp:

- Fixed Visual Studio compilation warnings.
- Fixed include order in xtfsutil_server.cpp
- Excluded UNIX stat members for WIN32.

git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@3573 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534