ntdll: Change NtQuerySystemInformation to return 100ns ticks for SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION info class (try 4)

[Louis Lenders]

Change from try 3: improved macro as per Juan's suggestion, and made user_hz a static variable 

 /proc/stat measures the times
 in units of USER_HZ, whereas Windows uses 100ns ticks.
 This should fix http://bugs.winehq.org/show_bug.cgi?id=23847


      
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