why sqlite3_extended_errcode not public ?

```
I try to use sqlite-net with csharp-sqlite
But there have an error below 

SQLite.cs(3074,44): error CS0122: 
`Community.CsharpSqlite.Sqlite3.sqlite3_extended_errcode(Community.CsharpSqlite.
Sqlite3.sqlite3)' is inaccessible due to its protection level


```

Original issue reported on code.google.com by `payne...@gmail.com` on 18 Jun 2014 at 11:59
