samba: bump to version 3.6.5 and enhancements

Bump samba to version 3.6.5 with SMB2 protocol support.

Use shared popt rather than the builtin - it saves some space if you've
already got it on your target.

mount.cifs & umount.cifs have been unbundled so remove the option -
users must use cifs-tools for that.

Add recommended enhancement from bug #807 (make iconv support optional).
Optional smbd was already commited some time ago.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>