kernel32: Moved ToolHelpHook16 to kernel16.c, it's not a toolhelp function.

dlls/kernel32/kernel16.c

@@ -106,6 +106,17 @@ LONG WINAPI KERNEL_nop(void)
     return 0;
 }
 
+/***********************************************************************
+ *           ToolHelpHook                             (KERNEL.341)
+ *	see "Undocumented Windows"
+ */
+FARPROC16 WINAPI ToolHelpHook16(FARPROC16 func)
+{
+    static FARPROC16 hook;
+
+    FIXME("(%p), stub.\n", func);
+    return InterlockedExchangePointer( (void **)&hook, func );
+}
 
 /* thunk for 16-bit CreateThread */
 struct thread_args

dlls/kernel32/toolhelp16.c

@@ -52,8 +52,6 @@ static struct notify
 
 static int nrofnotifys = 0;
 
-static FARPROC16 HookNotify = NULL;
-
 
 /***********************************************************************
  *           TaskFindHandle   (TOOLHELP.65)
@@ -226,19 +224,3 @@ BOOL16 WINAPI SystemHeapInfo16( SYSHEAPINFO *pHeapInfo )
     FreeLibrary16( gdi );
     return TRUE;
 }
-
-
-/***********************************************************************
- *           ToolHelpHook                             (KERNEL.341)
- *	see "Undocumented Windows"
- */
-FARPROC16 WINAPI ToolHelpHook16(FARPROC16 lpfnNotifyHandler)
-{
-	FARPROC16 tmp;
-
-	FIXME("(%p), stub.\n", lpfnNotifyHandler);
-	tmp = HookNotify;
-	HookNotify = lpfnNotifyHandler;
-	/* just return previously installed notification function */
-	return tmp;
-}