Remove AGG.

[gameblabla]

It's no longer needed because i now use my own port of Gnash that provides its own copy of AGG and it was the only piece of software using it.

This is also done for performance reasons as that means the whole AGG library can easily be PGO'd, something that would be a lot less easy if part of the OS.

Please see https://github.com/gameblabla/gnash-opendingux for more info and details.

To ease maintenance on the Funkey team and given that it was only useful for Gnash, it should be removed.

[DrUm78]

Done in my custom OS here.