oledlg: Exclude unused header

[Andrew Talbot]

Changelog:
    oledlg: Exclude unused header.

diff -urN a/dlls/oledlg/insobjdlg.c b/dlls/oledlg/insobjdlg.c
--- a/dlls/oledlg/insobjdlg.c	2007-01-22 13:06:46.000000000 +0000
+++ b/dlls/oledlg/insobjdlg.c	2007-05-15 22:00:30.000000000 +0100
@@ -25,7 +25,6 @@
 #include "winbase.h"
 #include "winreg.h"
 #include "winternl.h"
-#include "winnls.h"
 #include "winerror.h"
 #include "wingdi.h"
 #include "winuser.h"