Move fxge/android to if(is_android) on build

core/fxge/android/fpf_skiafont.cpp

Index: core/fxge/android/fpf_skiafont.cpp
diff --git a/core/fxge/android/fpf_skiafont.cpp b/core/fxge/android/fpf_skiafont.cpp
index 58e472247a74888667148daa5b3b19d5344d1ee2..9c1969738737d59389924854d03a77ad6ad5cd6a 100644
--- a/core/fxge/android/fpf_skiafont.cpp
+++ b/core/fxge/android/fpf_skiafont.cpp
@@ -4,13 +4,11 @@
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
-#include "core/fxcrt/fx_system.h"
-
-#if _FX_OS_ == _FX_ANDROID_
+#include "core/fxge/android/fpf_skiafont.h"
 
 #include <algorithm>
 
-#include "core/fxge/android/fpf_skiafont.h"
+#include "core/fxcrt/fx_system.h"
 #include "core/fxge/android/fpf_skiafontmgr.h"
 #include "core/fxge/fx_freetype.h"
 
@@ -215,5 +213,3 @@ FX_BOOL CFPF_SkiaFont::InitFont(CFPF_SkiaFontMgr* pFontMgr,
   m_dwRefCount = 1;
   return TRUE;
 }
-
-#endif  // _FX_OS_ == _FX_ANDROID_