Unbundle qsqlite

[marcusmueller]

Before posting

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• [x] I checked the issue tracker for similar issues
• [x] I checked the changelog if the issue is already resolved
• [x] I tried the latest Clementine build from here

System information

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Expected behaviour / actual behaviour

not bundling and building old versions of software which are available on user's machines, anyway

Thing is, QSQLite is just part of qt-devel for any platform I'm aware of; it's unlikely anyone would have a Qt5 installation without it. Funnily, we unbundled the sqlite that old versions of the qsqlite driver bundled and use the system one, which is clever, but highlights how ill-advised bundling that driver is.
So, aside from the maintenance overhead, and the bugs schlepped around from shipping an old version, we gain little from bundling it.

CMake-wise: We should be able to just check the Qt5::Sql target's PROPERTY QT_ALL_PLUGINS_sqldrivers for inclusion of Qt5::QSQLiteDriverPlugin, or directly depend on the Qt5::QSQLiteDriverPlugin component.

[hatstand]

IIRC, this was to let us setup FTS in sqlite

[marcusmueller]

ah yes, been digging through the code that uses it, though I have to say, I'm really not sure I would have gone through a Qt abstraction layer if I didn't want an abstracted database. I opened this issue before on the hunch that this would necessitate significant changes to datatabase*.