The rlib shares a same base name with SQLite

[lifthrasiir]

As per rust-lang/rfcs#109, rustsqlite now produces libsqlite3.rlib which shares a same base name with SQLite (libsqlite3.a) and causes a name conflict when linked by other crates. It can be resolved either by giving -C extra-filename=_rust (or similar) to rustc, or by renaming the library. It may also be made a non-issue when Cargo may resolve this as well.