Fix -Wunused-function warnings on Windows.

core/src/fxge/win32/fx_win32_gdipext.cpp

Index: core/src/fxge/win32/fx_win32_gdipext.cpp
diff --git a/core/src/fxge/win32/fx_win32_gdipext.cpp b/core/src/fxge/win32/fx_win32_gdipext.cpp
index ce65a26301b2dc8c781edc473fcc3cd447d3bc82..4beef9a177b8991f0274400cd9aa1cff3a85644f 100644
--- a/core/src/fxge/win32/fx_win32_gdipext.cpp
+++ b/core/src/fxge/win32/fx_win32_gdipext.cpp
@@ -5,27 +5,26 @@
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "../../../include/fxge/fx_ge.h"
+
 #if _FX_OS_ == _FX_WIN32_DESKTOP_ || _FX_OS_ == _FX_WIN64_DESKTOP_
 #include <windows.h>
 #include <algorithm>
+
 namespace Gdiplus {
 using std::min;
 using std::max;
 }  // namespace Gdiplus
+
 #include <gdiplus.h>
 #include "../../../include/fxge/fx_ge_win32.h"
 #include "win32_int.h"
+
 using namespace Gdiplus;
 using namespace Gdiplus::DllExports;
+
 #define GdiFillType2Gdip(fill_type) \
   (fill_type == ALTERNATE ? FillModeAlternate : FillModeWinding)
-static CombineMode GdiCombineMode2Gdip(int mode) {
-  switch (mode) {
-    case RGN_AND:
-      return CombineModeIntersect;

[Lei Zhang, 2015/08/17 03:44:10]

umm

-  }
-  return CombineModeIntersect;

[Lei Zhang, 2015/08/17 03:44:10]

ummmmmm

-}
+
 enum {
   FuncId_GdipCreatePath2,
   FuncId_GdipSetPenDashStyle,