Removed all non-standard common control headers from the include
directory.

diff --git a/dlls/comctl32/comboex.c b/dlls/comctl32/comboex.c
index 3144ab0..30794d7 100644
--- a/dlls/comctl32/comboex.c
+++ b/dlls/comctl32/comboex.c
@@ -18,10 +18,16 @@
 
 #include "winbase.h"
 #include "commctrl.h"
-#include "comboex.h"
 #include "debugtools.h"
 
-DEFAULT_DEBUG_CHANNEL(comboex)
+DEFAULT_DEBUG_CHANNEL(comboex);
+
+typedef struct
+{
+    HIMAGELIST himl;
+    HWND     hwndCombo;
+    DWORD      dwExtStyle;
+} COMBOEX_INFO;
 
 #define ID_CB_EDIT    1001