games/scummvm:

• Update to ScummVM 1.9.0
• 1.9.0 isn't hosted on SF anymore so switch MASTER_SITES to scummvm.org
• Switch to using SDL2 which is now ScummVM's default backend.
• SDL2 has an sndio audio backend so this makes it possible to use ScummVM with an sndio server.
• Adds an SNDIO option to the port to enable/disable the sndio MIDI backend. Currently this is picked up by accident when users have audio/sndio installed and compile ScummVM outside of Poudriere/Synth.
• Add a couple of missing LIB_DEPENDS

PR: 215128
Submitted by: Tobias Kortkamp <t@tobik.me>