When using the Vista SDK version of NTSecAPI.h it is necessary

	When using the Vista SDK version of NTSecAPI.h it is necessary
	to ensure the _WIN32_WINNT have a value of 0x0501 or greater.
	Otherwise, required LSA type declarations are undeclared.

	Provide a registry value that can be set to turn on Application
	Event log messages for debugging.

	HKLM\System\CurrentControlSet\Services\MIT Kerberos\Network Provider
		DWORD "Debug"

	Ensure that KFW_obtain_user_temp_directory() returns a value on
	error.

	Correct the declaration of KFW_copy_cache_to_system_file()
	to match the prototype.

ticket: 5469

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@19240 dc483132-0cff-0310-8789-dd5450dbe970