Upstream has released updates that appear to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing
Bukkit Changes:
aef9b6d2 PR-800: Add support for NoteBlock sounds in Skulls
CraftBukkit Changes:
ae8f5fc02 PR-1125: Add support for NoteBlock sounds in Skulls
0a1c89e4b SPIGOT-7212: Allow negative firework power
909a246af SPIGOT-7211: generateTree() with Consumer or Predicate is broken
c810c3ed8 Increase outdated build delay