merge to XFA: Fix -Wnon-virtual-dtor compiler warnings.

core/include/fxge/fx_font.h

Index: core/include/fxge/fx_font.h
diff --git a/core/include/fxge/fx_font.h b/core/include/fxge/fx_font.h
index 8744919cf800c2c6edb58d048fd0f8e7d1ff491f..73292a0fd1a8ed25b673001ecf55216d400a9a3b 100644
--- a/core/include/fxge/fx_font.h
+++ b/core/include/fxge/fx_font.h
@@ -274,6 +274,7 @@ public:
 class IFX_FontEnumerator
 {
 public:
+    virtual ~IFX_FontEnumerator() { }
 
     virtual void		HitFont() = 0;
 
@@ -282,6 +283,7 @@ public:
 class IFX_AdditionalFontEnum
 {
 public:
+    virtual ~IFX_AdditionalFontEnum() { }
     virtual int  CountFiles() = 0;
     virtual IFX_FileStream* GetFontFile(int index) = 0;
 };
@@ -328,6 +330,7 @@ class IFX_SystemFontInfo : public CFX_Object
 public:
     static IFX_SystemFontInfo*	CreateDefault();
     virtual void		Release() = 0;
+
     virtual	FX_BOOL		EnumFontList(CFX_FontMapper* pMapper) = 0;
     virtual void*		MapFont(int weight, FX_BOOL bItalic, int charset, int pitch_family, FX_LPCSTR face, FX_BOOL& bExact) = 0;
     virtual void*		MapFontByUnicode(FX_DWORD dwUnicode, int weight, FX_BOOL bItalic, int pitch_family)
@@ -347,6 +350,8 @@ public:
     {
         return NULL;
     }
+protected:
+    ~IFX_SystemFontInfo() { }
 };
 class CFX_FolderFontInfo : public IFX_SystemFontInfo
 {
@@ -460,6 +465,9 @@ class IFX_GSUBTable
 public:
     virtual void	Release() = 0;
     virtual FX_BOOL GetVerticalGlyph(FX_DWORD glyphnum, FX_DWORD* vglyphnum) = 0;
+
+protected:
+     ~IFX_GSUBTable() { }
 };
 IFX_GSUBTable* FXGE_CreateGSUBTable(CFX_Font* pFont);
 #endif