NSMB: Missing sound effects and instruments

[waddlesplash]

I know @endrift has said that the audio code is very incomplete, but here's a basic list of what's missing in NSMB:

• Coin sound effect is missing (both in game and on Nintendo logo)
• Koopa-squash sound effect is missing
• Goomba-squash sound effect is missing
• The melody instrument track is missing in the overworld theme (World 1-1, etc.)
• The melody instrument track is missing in the "game over" theme
• Flagpole slide sound is missing

[endrift]

Yeah this is PSG being missing.

[endrift]

Fixed in e9c1a53cfbf03252db40b5a19b830f8eb968c684.