Set kfw GUI read-only princ flag when appropriate

When receiving a request to obtain tickets (from another process), if a
particular principal is requested, set the read-only flag to prevent
the user from changing the principal.

Signed-off-by: Kevin Wasserman <kevin.wasserman@painless-security.com>

(cherry picked from commit b89802f0a491c6e8c6a320bc1af2b2bbbdb92669)

https://github.com/krb5/krb5/commit/5fc5e1abe785fdc89a539298bb049fa09cd8a3e8
Author: Kevin Wasserman <kevin.wasserman@painless-security.com>
Committer: Tom Yu <tlyu@mit.edu>
Commit: 5fc5e1abe785fdc89a539298bb049fa09cd8a3e8
Branch: krb5-1.10
 src/windows/leash/LeashView.cpp |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)