Upstream has released updates that appears 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:
3c844f35 #512: Expand Strider and Steerable entity API
CraftBukkit Changes:
32acc2621#686: Expand Strider and Steerable entity API
* She compiles!
Also readded the armorstand ticking patch, thanks cat
* Update mob goal api
* Misc fixes to make it run
drop per playing mob spawns for now