Android: Remove SQLite library

[kkaefer]

In #2856, we removed cURL in favor of native Android APIs. However, we're still using a compiled version of SQLite, since the SQLite library that ships with Android is inaccessible and only exposed in Java.

There are two ways to accomplish this:

• Implement the low-level API (sqlite3.hpp with a backend that uses Ithe Java API calls
• Implement the OfflineDatabase object in Java

#2356

[kkaefer]

I got started on implementing the low-level API, but the Java bindings are a little overengineered and it doesn't seem to be possible to replicate the interface we're using in sqlite3.hpp with the Java bindings without massive changes. That leaves implementing OfflineDatabase as the only alternative. I'm not feeling super good about adding a second implementation that needs to maintain parity. Thoughts @jfirebaugh?

[kkaefer]

For reference, progress stored in https://github.com/mapbox/mapbox-gl-native/tree/8048-android-sqlite, but I don't think it's viable as per the comment above.

[jfirebaugh]

If using Java bindings for SQLite isn't viable, then I recommend we simply stick with the current implementation.