Make SYSTEM_THREAD_INFORMATION.pszProcessName a UNICODE_STRING.

diff --git a/include/winternl.h b/include/winternl.h
index 93f9364..cd77ee8 100644
--- a/include/winternl.h
+++ b/include/winternl.h
@@ -1082,8 +1082,7 @@
     FILETIME ftCreationTime;
     FILETIME ftUserTime;
     FILETIME ftKernelTime;
-    DWORD dwUnknown2;
-    WCHAR *pszProcessName;
+    UNICODE_STRING ProcessName;
     DWORD dwBasePriority;
     DWORD dwProcessID;
     DWORD dwParentProcessID;