Miscellaneous fixes to finish up `remove-statics'. rlogin.c had a

Miscellaneous fixes to finish up `remove-statics'. rlogin.c had a
holdout static I hadn't noticed; unicode.c had one too; and a large
number of statics that were perfectly OK due to being constants have
been made `const', with assorted `const' repercussions all over the
place. I now declare `remove-statics' to be fixed.

git-svn-id: http://svn.tartarus.org/sgt/putty@2594 cda61777-01e9-0310-a592-d414129be87e