testing/chocolate-doom: upgrade to 3.1.0

• There's no release tarball (currently), so run ./autogen.sh in prepare
• New dependency on fluidsynth
• Patch to fix builds on gcc 10 is included in upstream release

added 5 commits

• 8ea5e7c5...82ea00e5 - 4 commits from branch alpine:master
• b1a42cc1 - testing/chocolate-doom: upgrade to 3.1.0

Compare with previous version

added 31 commits

• b1a42cc1...6f483d86 - 30 commits from branch alpine:master
• de79efa0 - testing/chocolate-doom: upgrade to 3.1.0

Compare with previous version

merged