gdb/

gdb/
	Code cleanup.
	* defs.h (find_memory_region_ftype): New typedef.
	(exec_set_find_memory_regions): Use it.
	* exec.c (exec_set_find_memory_regions): Use find_memory_region_ftype.
	* fbsd-nat.c (fbsd_find_memory_regions): Likewise.
	* gcore.c (objfile_find_memory_regions): Likewise.
	* gnu-nat.c (gnu_find_memory_regions): Likewise.
	* linux-nat.c (linux_nat_find_memory_regions): Likewise.
	* procfs.c (iterate_over_mappings_cb_ftype): Remove.
	(iterate_over_mappings): Rename iterate_over_mappings_cb_ftype to
	find_memory_region_ftype.
	(insert_dbx_link_bpt_in_region): Likewise.
	(iterate_over_mappings): Likewise.  Drop the comment part about the
	function prototype.
	(find_memory_regions_callback): Use find_memory_region_ftype.
	(proc_find_memory_regions): Likewise.
	(info_mappings_callback): Rename iterate_over_mappings_cb_ftype to
	find_memory_region_ftype.
	* target.c (dummy_find_memory_regions): Use find_memory_region_ftype.
	* target.h (struct target_ops) <to_find_memory_regions>: Likewise.