* coffread.c: General cleanup, and support for section offsets.

	* coffread.c: General cleanup, and support for section offsets.
	(time.h, sys/types.h, libbfd.h): Don't include.
	(cur_src_start_addr, cur_src_end_addr): Rename to
	current_source_start_addr, current_source_end_addr.
	(nlist_stream_global): Remove.
	(nlist_bfd_global): New global variable.
	(coff_symfile_read): Remove code that gets and uses fileno()
	directly.
	(read_coff_symtab, enter_linenos, process_coff_symbol): Add
	section_offsets parameter, add text/data section offset to
	appropriate symbols' values.
	(read_one_sym): Use bfd_read instead of fread.
	(init_stringtab, init_lineno): Change first parameter to a bfd,
	use bfd routines instead of raw I/O.