pull up r19632 from trunk

pull up r19632 from trunk

 r19632@cathode-dark-space:  jaltman | 2007-06-22 15:03:57 -0400
 ticket: 5584

 1. Use the debug CRT versions of the memory allocation functions in
    util\perfstat.c.  These functions allow associating file and line
    numbers with each allocation.

 2. Perform a heap verification periodically to check for heap
    corruption in the debug build when using util\perfstat.c to manage
    memory allocations.

 3. Change wcscmp() to _wcscmp() for compatibility in util\perfstat.h

ticket: 5584

git-svn-id: svn://anonsvn.mit.edu/krb5/branches/krb5-1-6@19790 dc483132-0cff-0310-8789-dd5450dbe970