Make sure the correct luckstone is the prize

The first generated luckstone is marked as the prize in mines' end.
Make sure we generate the intended one first, before any other
(possibly randomly generated) luckstones.

dat/mines.des

@@ -1042,6 +1042,7 @@ OBJECT:('!',"booze"),(10,09)
 OBJECT:('!',"object detection"),(10,09)
 # Objects
 # The Treasure chamber...
+OBJECT:('*',"luckstone"),(70,05)
 OBJECT:('*',"diamond"),(69,04)
 OBJECT:'*',(69,04)
 OBJECT:('*',"diamond"),(69,04)
@@ -1058,7 +1059,6 @@ OBJECT:('*',"ruby"),(70,05)
 OBJECT:('*',"amethyst"),(70,05)
 OBJECT:'*',(70,05)
 OBJECT:('*',"amethyst"),(70,05)
-OBJECT:('*',"luckstone"),(70,05)
 # Scattered gems...
 OBJECT:'*',random
 OBJECT:'*',random
@@ -1147,24 +1147,24 @@ STAIR:(42,8),up
 WALLIFY
 
 # Objects
-OBJECT:('*',"diamond"),random
-OBJECT:'*',random
-OBJECT:('*',"diamond"),random
-OBJECT:'*',random
-OBJECT:('*',"emerald"),random
-OBJECT:'*',random
-OBJECT:('*',"emerald"),random
-OBJECT:'*',random
-OBJECT:('*',"emerald"),random
-OBJECT:'*',random
-OBJECT:('*',"ruby"),random
-OBJECT:'*',random
-OBJECT:('*',"ruby"),random
-OBJECT:('*',"amethyst"),random
-OBJECT:'*',random
-OBJECT:('*',"amethyst"),random
 OBJECT:('*',"luckstone"),$place[0]
 OBJECT:('*',"flint"),$place[1]
+OBJECT:('*',"diamond"),random
+OBJECT:'*',random
+OBJECT:('*',"diamond"),random
+OBJECT:'*',random
+OBJECT:('*',"emerald"),random
+OBJECT:'*',random
+OBJECT:('*',"emerald"),random
+OBJECT:'*',random
+OBJECT:('*',"emerald"),random
+OBJECT:'*',random
+OBJECT:('*',"ruby"),random
+OBJECT:'*',random
+OBJECT:('*',"ruby"),random
+OBJECT:('*',"amethyst"),random
+OBJECT:'*',random
+OBJECT:('*',"amethyst"),random
 OBJECT:'?',random
 OBJECT:'?',random
 OBJECT:'?',random

doc/fixes36.3

@@ -23,6 +23,7 @@ when co-located with a boulder you could sometimes swap places with pets of
 	any size
 on rare occasions, multiple mines-end luckstones were being marked as the
 	prize and triggering an impossible() on a public server
+make sure the correct luckstone is the prize in mine's end
 
 
 Fixes to Post-3.6.2 Problems that Were Exposed Via git Repository