* subsegs.h (segment_info_type): If MANY_SEGMENTS and not
BFD_ASSEMBLER, add name field.
* config/obj-coff.c (coff_header_append): Handle long section
names.
(crawl_symbols): Just use the name field for the symbol name,
without worrying about null byte termination.
(w_strings): Handle long section names.
(write_object_file): Likewise. Also, use the name field, rather
than scnhdr.s_name.
(obj_coff_add_segment): Permit long section names.
(obj_coff_init_stab_section): Use the name field, rather than
scnhdr.s_name.
(adjust_stab_section): Likewise.
* config/te-pe.h (COFF_LONG_SECTION_NAMES): Define.