drop pool ver 1 import support

this unloved streaming format is internal only now and used
for editengine c&p and (reportedly) autotable format storage.

So we shouldn't encounter version 1 files anymore

coverity#1242764 Untrusted loop bound

Change-Id: If8e5717e997cf915f45f6e9484bb97d472e4dc2f

include/svl/itempool.hxx

@@ -77,7 +77,6 @@ private:
     sal_uInt16                      GetIndex_Impl(sal_uInt16 nWhich) const;
     sal_uInt16                      GetSize_Impl() const;
 
-    SVL_DLLPRIVATE SvStream&        Load1_Impl( SvStream &rStream );
     SVL_DLLPRIVATE bool             IsItemFlag_Impl( sal_uInt16 nWhich, sal_uInt16 nFlag ) const;
 
 public: