Fix -Wnon-virtual-dtor compiler warnings.

fpdfsdk/src/fpdf_sysfontinfo.cpp

Index: fpdfsdk/src/fpdf_sysfontinfo.cpp
diff --git a/fpdfsdk/src/fpdf_sysfontinfo.cpp b/fpdfsdk/src/fpdf_sysfontinfo.cpp
index 0e0114b372cb46817df7781b631896a00a05ec9b..f60dc9723e8cf39d47c331d5e34b536add00d8fc 100644
--- a/fpdfsdk/src/fpdf_sysfontinfo.cpp
+++ b/fpdfsdk/src/fpdf_sysfontinfo.cpp
@@ -75,6 +75,9 @@ public:
 		if (m_pInfo->DeleteFont)
 			m_pInfo->DeleteFont(m_pInfo, hFont);
 	}
+
+private:
+        ~CSysFontInfo_Ext() { }

[brucedawson, 2015/01/09 00:20:49]

It feels like this should be dealt with by the class that introduces the virtual
functions not in the derived class.

[Tom Sepez, 2015/01/09 01:16:53]

Done.

 };
 
 DLLEXPORT void STDCALL FPDF_AddInstalledFont(void* mapper, const char* name, int charset)