* elf.c (elf_modify_segment_map): Add remove_empty_load param.

	Don't remove empty PT_LOAD header if false.
	(_bfd_elf_map_sections_to_segments): If user phdrs, pass false
	to elf_modify_segment_map.
	(assign_file_positions_for_load_sections): Pass false to
	elf_modify_segment_map.