Add missing forward reference to KeInitializeThread()

xtoskrnl/includes/i686/kepfuncs.h

@@ -24,6 +24,17 @@ XTAPI
 PKTHREAD
 KeGetCurrentThread(VOID);
 
+XTAPI
+XTSTATUS
+KeInitializeThread(IN PKTHREAD Thread,
+                   IN PVOID Stack,
+                   IN PKSYSTEM_ROUTINE SystemRoutine,
+                   IN PKSTART_ROUTINE StartRoutine,
+                   IN PVOID StartContext,
+                   IN PCONTEXT Context,
+                   IN PVOID EnvironmentBlock,
+                   IN PKPROCESS Process);
+
 XTAPI
 VOID
 KepArchInitialize(VOID);