Make REINCARNATION unconditional.

There is a lot of code affected by this, and Pat Rankin correctly
observes that it would be better to store roguelike as a level flag
rather than just using Is_rogue_level. A note for the future.

src/extralev.c

@@ -9,8 +9,6 @@
 
 #include "hack.h"
 
-#ifdef REINCARNATION
-
 struct rogueroom {
 	xchar rlx, rly;
 	xchar dx, dy;
@@ -336,6 +334,5 @@ makerogueghost()
 		ghostobj->known = TRUE;
 	}
 }
-#endif /* REINCARNATION */
 
 /*extralev.c*/