* symfile.c (add_psymbol_to_bcache): Return a const pointer. Use

	* symfile.c (add_psymbol_to_bcache): Return a const pointer.  Use
	bcache_full.
	(append_psymbol_to_list): Accept a const pointer.
	(add_psymbol_to_list): Fix const correctness.
	* bcache.h: (deprecated_bcache_added, deprecated_bcache): Remove.
	(bcache_full): Declare.
	* bcache.c (bcache_data, deprecated_bcache): Remove.
	(bcache): Use bcache_full.
	(bcache_full): Rename from deprecated_bcache_added.  Change return
	type.