Rogue V4: fix arithmetic operations on boolean variables.

Monsters created by scrolls should now have their placement randomized
correctly again.

rogue4/passages.c

@@ -329,7 +329,7 @@ passnum(void)
     for (rp = rooms; rp < &rooms[MAXROOMS]; rp++)
 	for (i = 0; i < rp->r_nexits; i++)
 	{
-	    newpnum++;
+	    newpnum = TRUE;
 	    numpass(rp->r_exit[i].y, rp->r_exit[i].x);
 	}
 }

rogue4/potions.c

@@ -246,7 +246,7 @@ turn_see(bool turn_off)
 	    if (!can_see)
 	    {
 		standend();
-		add_new++;
+		add_new = TRUE;
 	    }
 	}
     }

rogue4/scrolls.c

@@ -90,7 +90,7 @@ read_scroll(void)
 	     * otherwise give up
 	     */
 	    {
-		register bool appear = 0;
+		register int appear = 0;
 		coord mp;
 
 		/*