tidy binary, ihex and verilog

	* binary.c (binary_sizeof_headers): Delete function.  Define
	instead.
	* ihex.c (ihex_sizeof_headers): Likewise.
	(ihex_vec): Use _bfd_nosymbols for BFD_JUMP_TABLE_SYMBOLS.  Delete
	now unused defines.
	* verilog.c: Delete unused defines.