PSID -> PISID and /rtl /ntoskrnl/se duplication.

[Alex Ionescu]

Hi,

Attached is a patch with uses the proper PSID/PISID types. Also, I've 
noticed that we currently have duplicated code between /lib/rtl and 
/ntoskrnl/se. The removals are also in this patch. Is it OK to remove 
them, or is there some reason they must be duplicated?

Best regards,
Alex Ionescu