comment some future cleanup for cc_mslsa.c

The function does_query_ticket_cache_ex2() will not be needed once
Windows Server 2003 drops out of support in approximately one year's
time.  Note the doom timer at its definition, to facilitate future
cleanup.

https://github.com/krb5/krb5/commit/9d16f24e59e2a0f0809741236344394da49935e2
Author: Ben Kaduk <kaduk@mit.edu>
Commit: 9d16f24e59e2a0f0809741236344394da49935e2
Branch: master
 src/lib/krb5/ccache/cc_mslsa.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)