pull up r19440 from trunk

pull up r19440 from trunk

 r19440@cathode-dark-space:  jaltman | 2007-04-12 17:19:33 -0400
 ticket: new
 subject: NIM - Fix taskbar button visibility on Vista
 component: windows
 tags: pullup

 Although the Platform SDK docs suggest using ITaskbarList to add/remove
 a taskbar button on the fly, it doesn't work on Vista.  Instead we will
 just set the window style to use WS_EX_APPWINDOW and be done with it.

 No change in the NIM version number.

ticket: 5526
version_fixed: 1.6.1

git-svn-id: svn://anonsvn.mit.edu/krb5/branches/krb5-1-6@19441 dc483132-0cff-0310-8789-dd5450dbe970