arm64 : fix mempool align

public/zip_utils.cpp

@@ -1569,7 +1569,7 @@ void CZipFile::SaveDirectory( IWriteStream& stream )
 				free( e->m_pData );
 
 				// temp hackery for the logic below to succeed
-				e->m_pData = (void*)0xFFFFFFFF;
+				e->m_pData = (void*)-1;
 			}
 		}
 	}