Make zombie pigs and skeletons (+variants) wear armor (fixes #3169)

mods/ENTITIES/mobs_mc/skeleton+stray.lua

@@ -21,6 +21,7 @@ local skeleton = {
 	xp_min = 6,
 	xp_max = 6,
 	breath_max = -1,
+	wears_armor = 1,
 	armor = {undead = 100, fleshy = 100},
 	collisionbox = {-0.3, -0.01, -0.3, 0.3, 1.98, 0.3},
 	pathfinding = 1,

mods/ENTITIES/mobs_mc/skeleton_wither.lua

@@ -18,6 +18,7 @@ mcl_mobs.register_mob("mobs_mc:witherskeleton", {
 	xp_min = 6,
 	xp_max = 6,
 	breath_max = -1,
+	wears_armor = 1,
 	armor = {undead = 100, fleshy = 100},
 	pathfinding = 1,
 	group_attack = true,

mods/ENTITIES/mobs_mc/zombiepig.lua

@@ -20,6 +20,7 @@ local pigman = {
 	hp_max = 20,
 	xp_min = 6,
 	xp_max = 6,
+	wears_armor = 1,
 	armor = {undead = 90, fleshy = 90},
 	attack_type = "dogfight",
 	group_attack = { "mobs_mc:pigman", "mobs_mc:baby_pigman" },