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/muse.c

@@ -1080,9 +1080,7 @@ struct monst *mtmp;
 				unsolid(mtmp->data) || !rn2(10))
 		       && dist2(mtmp->mx,mtmp->my,mtmp->mux,mtmp->muy) <= 2
 		       && mtmp->mcansee && haseyes(mtmp->data)
-#ifdef REINCARNATION
 		       && !Is_rogue_level(&u.uz)
-#endif
 		       && (!In_endgame(&u.uz) || Is_earthlevel(&u.uz))) {
 		    m.offensive = obj;
 		    m.has_offense = MUSE_SCR_EARTH;