Get rid of the rdtsc cpu instruction method for calculation of the
performance counter. Put the calculation (based on gettimeofday) in
NtQueryPerformanceCounter() and use that in the kernel functions.

diff --git a/include/winternl.h b/include/winternl.h
index bccdb3d..b041a8e 100644
--- a/include/winternl.h
+++ b/include/winternl.h
@@ -1412,6 +1412,7 @@
 NTSTATUS  WINAPI NtQueryKey(HKEY,KEY_INFORMATION_CLASS,void *,DWORD,DWORD *);
 NTSTATUS  WINAPI NtQueryMultipleValueKey(HKEY,PVALENTW,ULONG,PVOID,ULONG,PULONG);
 NTSTATUS  WINAPI NtQueryObject(HANDLE, OBJECT_INFORMATION_CLASS, PVOID, ULONG, PULONG);
+NTSTATUS  WINAPI NtQueryPerformanceCounter(PLARGE_INTEGER, PLARGE_INTEGER);
 NTSTATUS  WINAPI NtQuerySecurityObject(HANDLE,SECURITY_INFORMATION,PSECURITY_DESCRIPTOR,ULONG,PULONG);
 NTSTATUS  WINAPI NtQuerySystemInformation(SYSTEM_INFORMATION_CLASS,PVOID,ULONG,PULONG);
 NTSTATUS  WINAPI NtQuerySystemTime(PLARGE_INTEGER);