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Add a missing const in unfinished/sokoban.c.

I noticed this when I temporarily enabled compilation of all the
unfinished puzzles while doing the bool trawl.

--- a/unfinished/sokoban.c

+++ b/unfinished/sokoban.c

@@ -957,7 +957,7 @@

  * subfunction. move_type() returns -1 for an illegal move, 0 for a

  * movement, and 1 for a push.

  */

-int move_type(game_state *state, int dx, int dy)

+int move_type(const game_state *state, int dx, int dy)

 {

     int w = state->p.w, h = state->p.h;

     int px = state->px, py = state->py;