oox: workaround C2249 error on MSVC 14.0

The member is inherited from a nonpublic virtual base class or
structure.

Declaring copy ctor and assignment operator as deleted in derived
class solved the problem.

Change-Id: Ic509f7e7311fd896656ecff80df3ece4503c3a65
Reviewed-on: https://gerrit.libreoffice.org/18328Reviewed-by: David Ostrovsky <david@ostrovsky.org>
Tested-by: David Ostrovsky <david@ostrovsky.org>

include/oox/helper/binaryinputstream.hxx

@@ -220,6 +220,10 @@ protected:
     /** This dummy default c'tor will never call the c'tor of the virtual base
         class BinaryStreamBase as this class cannot be instantiated directly. */
     BinaryInputStream() : BinaryStreamBase( false ) {}
+
+private:
+    BinaryInputStream( BinaryInputStream const& ) = delete;
+    BinaryInputStream& operator=( BinaryInputStream const& ) = delete;
 };
 
 typedef std::shared_ptr< BinaryInputStream > BinaryInputStreamRef;

include/oox/helper/binaryoutputstream.hxx

@@ -86,6 +86,10 @@ protected:
     /** This dummy default c'tor will never call the c'tor of the virtual base
         class BinaryStreamBase as this class cannot be instantiated directly. */
     BinaryOutputStream() : BinaryStreamBase( false ) {}
+
+private:
+    BinaryOutputStream( BinaryOutputStream const& ) = delete;
+    BinaryOutputStream& operator=( BinaryOutputStream const& ) = delete;
 };
 
 template< typename Type >