rsync and kerberos

[Bacchella Fabrice]

Still working on my gss patch.

Here a more polished patch against rsync-3.0.3. It should work out of  
the box.

I tested it on Solaris 10 x86 (64 bits compilation), Mac OS 10.5 (32  
but not 64 bits), Linux (Gentoo with MIT Kerberos 64 bits).

To use it :
add this to your module configuration :
use gssapi = yes
auth users = <list of kerberos principals>