Use const for static tree descriptions in deflate.

This is in order to permit shared memory for these structures.

deflate.h

@@ -83,7 +83,7 @@ typedef struct static_tree_desc_s static_tree_desc;
 typedef struct tree_desc_s {
  ct_data *dyn_tree; /* the dynamic tree */
  int max_code; /* largest code with non zero frequency */
- static_tree_desc *stat_desc; /* the corresponding static tree */
+ const static_tree_desc *stat_desc;  /* the corresponding static tree */
 } FAR tree_desc;
 
 typedef ush Pos;

trees.c

@@ -122,13 +122,13 @@ struct static_tree_desc_s {
  int max_length; /* max bit length for the codes */
 };
 
-local static_tree_desc static_l_desc =
+local const static_tree_desc static_l_desc =
 {static_ltree, extra_lbits, LITERALS+1, L_CODES, MAX_BITS};
 
-local static_tree_desc static_d_desc =
+local const static_tree_desc static_d_desc =
 {static_dtree, extra_dbits, 0, D_CODES, MAX_BITS};
 
-local static_tree_desc static_bl_desc =
+local const static_tree_desc static_bl_desc =
 {(const ct_data *)0, extra_blbits, 0, BL_CODES, MAX_BL_BITS};
 
 /* ===========================================================================