Fix FX_BOOL compilation errors under windows

fpdfsdk/include/pdfwindow/PWL_IconList.h

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #ifndef FPDFSDK_INCLUDE_PDFWINDOW_PWL_ICONLIST_H_
 #define FPDFSDK_INCLUDE_PDFWINDOW_PWL_ICONLIST_H_
 
 #include "../../../core/include/fxcrt/fx_string.h"
@@ skipping 69 matching lines @@
         virtual FX_BOOL                                         OnLButtonDown(const CPDF_Point & point, FX_DWORD nFlag);
         virtual FX_BOOL                                         OnLButtonUp(const CPDF_Point & point, FX_DWORD nFlag);
         virtual FX_BOOL                                         OnMouseMove(const CPDF_Point & point, FX_DWORD nFlag);
         virtual FX_BOOL                                         OnKeyDown(FX_WORD nChar, FX_DWORD nFlag);
 
 private:
         CPWL_IconList_Item*                                     GetListItem(int32_t nItemIndex) const;
         void                                                            SelectItem(int32_t nItemIndex, FX_BOOL bSelect);
         int32_t                                                 FindItemIndex(const CPDF_Point& point);
 
-        FX_BOOL                                                         m_nSelectIndex;
+        int32_t                                                         m_nSelectIndex;
         IPWL_IconList_Notify*                           m_pNotify;
         FX_BOOL                                                         m_bEnableNotify;
         FX_BOOL                                                         m_bMouseDown;
         int32_t                                                 m_nListCount;
 };
 
 class PWL_CLASS CPWL_IconList : public CPWL_Wnd
 {
 public:
         CPWL_IconList(int32_t nListCount);
@@ skipping 18 matching lines @@
         virtual void                                            CreateChildWnd(const PWL_CREATEPARAM & cp);
 
         virtual void                                            OnNotify(CPWL_Wnd* pWnd, FX_DWORD msg, intptr_t wParam = 0, intptr_t lParam = 0);
 
 private:
         CPWL_IconList_Content*                          m_pListContent;
         int32_t                                                 m_nListCount;
 };
 
 #endif  // FPDFSDK_INCLUDE_PDFWINDOW_PWL_ICONLIST_H_