xercesc: BinMemInputStream: Add missing const_cast

git-svn-id: https://svn.apache.org/repos/asf/xerces/c/trunk@1798767 13f79535-47bb-0310-9956-ffa450edef68

src/xercesc/util/BinMemInputStream.cpp

@@ -65,7 +65,7 @@ BinMemInputStream::~BinMemInputStream()
     //  cast off the const'ness in that case in order to delete it.
     //
     if ((fBufOpt == BufOpt_Adopt) || (fBufOpt == BufOpt_Copy))
-        fMemoryManager->deallocate((XMLByte*)fBuffer);//delete [] (XMLByte*)fBuffer;
+        fMemoryManager->deallocate(const_cast<XMLByte*>(fBuffer));//delete [] (XMLByte*)fBuffer;
 }