Fix axolotl heads on 5.11.0

mods/ENTITIES/mcl_mobs/effects.lua

@@ -388,7 +388,9 @@ function mob_class:check_head_swivel(dtime)
 	if self.object.get_bone_override then -- minetest >= 5.9
 		self.object:set_bone_override(self.head_swivel, {
 			position = { vec = self.head_bone_position, absolute = true },
-			rotation = { vec = newr, absolute = true, interpolation = 0.1 } })
+			rotation = { vec = newr, absolute = true, interpolation = 0.1 },
+			scale = self.head_scale and { vec = self.head_scale, absolute = true, interpolation = 0.1 } or nil,
+		})
 	else -- minetest < 5.9
 		-- old API uses degrees not radians and absolute positions
 		self.object:set_bone_position(self.head_swivel, self.head_bone_position, vector.apply(newr, math.deg))

mods/ENTITIES/mcl_mobs/init.lua

@@ -157,6 +157,7 @@ function mcl_mobs.register_mob(name, def)
 		head_bone_position = def.head_bone_position or { 0, def.bone_eye_height or 1.4, def.horizontal_head_height or 0},
 		curiosity = def.curiosity or 1, -- how often mob will look at player on idle
 		head_yaw = def.head_yaw or "y", -- axis to rotate head on
+		head_scale = def.head_scale,
 		wears_armor = def.wears_armor, -- a number value used to index texture slot for armor
 		stepheight = def.stepheight or 0.6,
 		name = name,

mods/ENTITIES/mobs_mc/axolotl.lua

@@ -16,6 +16,7 @@ local axolotl = {
 	head_bone_position = vector.new( 0, -1, 0 ), -- for minetest <= 5.8
 	curiosity = 10,
 	head_yaw="z",
+	head_scale = vector.new(1,-1,-1),
 
 	armor = 100,
 	rotate = 180,