Motivation / Problem

FluidSynth provides a build option to set a default soundfont which may be overridden by Linux distributions such as Debian to support alternative soundfont providers (such as Fluid, OPL-3, MuseScore, ...). This PR enables OpenTTD to use this default soundfont if present, which is arguably more flexible than maintaining the hard-coded list in the OpenTTD code base.

As an immediate benefit of this, the Flatpak build of OpenTTD will no longer require patching the hard-coded list. Instead, only FluidSynth needs to be configured with an appropriate default soundfont in place inside the runtime.

Description

The implementation now loads the default soundfont configured with FluidSynth, if any. The previous find-first lookup from the hard-coded soundfont list is still used as a fallback if no suitable default soundfont is found.

Checklist for review

Some things are not automated, and forgotten often. This list is a reminder for the reviewers.

• The bug fix is important enough to be backported? (label: 'backport requested')
• This PR affects the save game format? (label 'savegame upgrade')
• This PR affects the GS/AI API? (label 'needs review: Script API')
  • ai_changelog.hpp, gs_changelog.hpp need updating.
  • The compatibility wrappers (compat_*.nut) need updating.
• This PR affects the NewGRF API? (label 'needs review: NewGRF')
  • newgrf_debug_data.h may need updating.
  • PR must be added to API tracker