user32: downgrade a FIXME to a WARN

[Austin English]

This shows up a ton in Office 2007...

-- 
-Austin
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diff --git a/dlls/user32/hook.c b/dlls/user32/hook.c
index 0b0d7c4..b6dc8e8 100644
--- a/dlls/user32/hook.c
+++ b/dlls/user32/hook.c
@@ -891,6 +891,7 @@ void WINAPI NotifyWinEvent(DWORD event, HWND hwnd, LONG object_id, LONG child_id
  */
 BOOL WINAPI IsWinEventHookInstalled(DWORD dwEvent)
 {
-    FIXME("(%d)-stub!\n", dwEvent);
+    /* FIXME: Needed by Office 2007 installer */
+    WARN("(%d)-stub!\n", dwEvent);
     return TRUE;
 }