gdb/

gdb/
	Code cleanup.
	* dictionary.c
	(struct dict_vector) <iter_match_first, iter_match_next>
	(iter_match_first_hashed, iter_match_next_hashed)
	(iter_match_first_linear, iter_match_next_linear)
	(dict_iter_match_first, dict_iter_match_next, iter_match_first_hashed)
	(iter_match_next_hashed, iter_match_first_linear)
	(iter_match_next_linear): Use symbol_compare_ftype.
	* dictionary.h: Include symfile.h.
	(dict_iter_match_first, dict_iter_match_next): Use
	symbol_compare_ftype.
	* dwarf2read.c (dw2_map_matching_symbols): Likewise.
	* psymtab.c (match_partial_symbol, match_partial_symbol, map_block)
	(map_matching_symbols_psymtab): Likewise.
	* symfile.h (symbol_compare_ftype): New typedef.
	(struct quick_symbol_functions) <map_matching_symbols): Use
	symbol_compare_ftype.