* nm.c: Include libiberty.h.

	* nm.c: Include libiberty.h.
	(sort_by_size): New static variable.
	(long_options): Add --size-sort.
	(usage): Mention --size-sort.
	(numeric_forward): Make static.  Change from void * to PTR.
	(numeric_reverse): Likewise.
	(non_numeric_forward, non_numeric_reverse): Likewise.
	(sorters): Change declaration from void * to PTR.
	(size_forward, sort_symbol_by_size): New static functions.
	(display_rel_file): Handle sort_by_size.
	(filter_symbols): If sort_by_size, discard absolute and undefined
	symbols.
	* binutils.texi (nm): Document --size-sort.
	* nm.1: Document --size-sort.
PR 3611.