Fix exploding landmine and boulders next to lava

Same issue as with breaking a wand of digging in commit 7ce0751a

include/extern.h

@@ -128,6 +128,7 @@ extern void reset_trapset(void);
 extern int use_whip(struct obj *) NONNULLPTRS;
 extern boolean could_pole_mon(void);
 extern int use_pole(struct obj *, boolean) NONNULLPTRS;
+extern void maybe_dunk_boulders(coordxy, coordxy);
 extern void fig_transform(union any *, long) NONNULLARG1;
 extern int unfixable_trouble_count(boolean);
 

src/apply.c

@@ -42,7 +42,6 @@ staticfn void display_grapple_positions(boolean);
 staticfn int use_grapple(struct obj *);
 staticfn void discard_broken_wand(void);
 staticfn void broken_wand_explode(struct obj *, int, int);
-staticfn void maybe_dunk_boulders(coordxy, coordxy);
 staticfn int do_break_wand(struct obj *);
 staticfn int apply_ok(struct obj *);
 staticfn int flip_through_book(struct obj *);
@@ -3856,7 +3855,7 @@ broken_wand_explode(struct obj *obj, int dmg, int expltype)
 }
 
 /* if x,y has lava or water, dunk any boulders at that location into it */
-staticfn void
+void
 maybe_dunk_boulders(coordxy x, coordxy y)
 {
     struct obj *otmp;

src/trap.c

@@ -3133,6 +3133,8 @@ blow_up_landmine(struct trap *trap)
         }
     }
     fill_pit(x, y);
+    maybe_dunk_boulders(x, y);
+    recalc_block_point(x, y);
     spot_checks(x, y, old_typ);
 }