C++ safety for leashdll.h

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

https://github.com/krb5/krb5/commit/0101affa062aa34398bd571740d8d84f6bf45d4d
Author: Kevin Wasserman <kevin.wasserman@painless-security.com>
Committer: Ben Kaduk <kaduk@mit.edu>
Commit: 0101affa062aa34398bd571740d8d84f6bf45d4d
Branch: master
 src/windows/leashdll/leashdll.h |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)