Changes to the Kerberos SSL code by Jeffrey Altman <jaltman@columbia.edu>

Changes to the Kerberos SSL code by Jeffrey Altman <jaltman@columbia.edu>
His comments are:

 . Fixed all of the Windows dynamic loading functions, prototypes, etc.

 . Corrected all of the unsigned/signed comparison warnings

 . Replaced the references to krb5_cksumarray[] for two reasons.
   First, it was an internal variable that should not have been
   referenced outside the library; nor could it have been with
   a shared library with restricted exports.  Second, the
   variable is no longer used in current Kerberos implementations.
   I replaced the code with equivalent functionality using functions
   that are exported from the library.