backguard compatibility for mount.lua

* close https://notabug.org/TenPlus1/mobs_redo/issues/112
* close https://codeberg.org/minenux/minetest-mod-mobs_redo/issues/106

mount.lua

@@ -4,6 +4,9 @@ local abs, cos, floor, sin, sqrt, pi =
 		math.abs, math.cos, math.floor, math.sin, math.sqrt, math.pi
 ------------------------------------------------------------------------------
 
+-- check for minetest 5.x compatibility
+local is_50 = minetest.get_translator or nil
+
 --
 -- Helper functions
 --
@@ -85,9 +88,15 @@ local function force_detach(player)
 	end
 
 	player:set_detach()
-	player_api.player_attached[player:get_player_name()] = false
+	if is_50 then
-	player:set_eye_offset({x = 0, y = 0, z = 0}, {x = 0, y = 0, z = 0})
+		player_api.player_attached[player:get_player_name()] = false
-	player_api.set_animation(player, "stand", 30)
+		player:set_eye_offset({x = 0, y = 0, z = 0}, {x = 0, y = 0, z = 0})
+		player_api.set_animation(player, "stand", 30)
+	else
+		default.player_attached[player:get_player_name()] = false
+		player:set_eye_offset({x = 0, y = 0, z = 0}, {x = 0, y = 0, z = 0})
+		default.player_set_animation(player, "stand", 30)
+	end
 	player:set_properties({visual_size = {x = 1, y = 1}})
 
 end
@@ -170,7 +179,11 @@ function mobs.attach(entity, player)
 	force_detach(player)
 
 	player:set_attach(entity.object, "", attach_at, entity.player_rotation)
-	player_api.player_attached[player:get_player_name()] = true
+	if is_50 then
+		player_api.player_attached[player:get_player_name()] = true
+	else
+		default.player_attached[player:get_player_name()] = true
+	end
 	player:set_eye_offset(eye_offset, {x = 0, y = 0, z = 0})
 
 	player:set_properties({
@@ -183,7 +196,11 @@ function mobs.attach(entity, player)
 	minetest.after(0.2, function()
 
 		if player and player:is_player() then
-			player_api.set_animation(player, "sit", 30)
+			if is_50 then
+				player_api.set_animation(player, "sit", 30)
+			else
+				default.player_set_animation(player, "sit", 30)
+			end
 		end
 	end)