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:
19830133 PR-925: Add hit entity/block to events extending ProjectileHitEvent
CraftBukkit Changes:
5a72c3c04 SPIGOT-7510: Try to fix broken reflection usage of plugins
6fa69f235 PR-1281: Add hit entity/block to events extending ProjectileHitEvent
224f733ac Fix NPE introduced in #f4d977e
