cifs-utils: update 6.2 -> 6.3

January 9, 2014: Release 6.3:
* fixes for various bugs turned up by Coverity
* clean unused cruft out of upcall binary
* add new pam_cifscreds PAM module for establishing NTLM creds on login
* https://lists.samba.org/archive/samba-technical/2014-January/097124.html