One more defensive assert, just to be sure.


git-svn-id: svn://svn.tartarus.org/sgt/putty@9997 cda61777-01e9-0310-a592-d414129be87e
Bump version number prior to tagging 0.63.


git-svn-id: svn://svn.tartarus.org/sgt/putty@9998 cda61777-01e9-0310-a592-d414129be87e