* libxcoff.h (struct xcoff_backend_data_rec): Constify src param

	* libxcoff.h (struct xcoff_backend_data_rec): Constify src param
	of _xcoff_swap_ld*.
	* coff-rs6000.c (xcoff_swap_ldhdr_in): Modify type of external
	param to agree with libxcoff.h.
	(xcoff_swap_ldhdr_out): Likewise.
	(xcoff_swap_ldsym_in): Likewise.
	(xcoff_swap_ldsym_out): Likewise.
	(xcoff_swap_ldrel_in): Likewise.
	(xcoff_swap_ldrel_out): Likewise.
	(xcoff_create_csect_from_smclas): Likewise.
	* coff64-rs6000.c: Add missing prototypes.
	(xcoff64_swap_ldhdr_in): Modify type of external param to agree
	with libxcoff.h.
	(xcoff64_swap_ldhdr_out): Likewise.
	(xcoff64_swap_ldsym_in): Likewise.
	(xcoff64_swap_ldsym_out): Likewise.
	(xcoff64_swap_ldrel_in): Likewise.
	(xcoff64_swap_ldrel_out): Likewise.
	(xcoff64_ppc_relocate_section): Make static.
	(xcoff64_slurp_armap): Likewise.
	(xcoff64_archive_p): Likewise.
	(xcoff64_openr_next_archived_file): Likewise.
	(xcoff64_sizeof_headers): Likewise.
	(xcoff64_is_lineno_count_overflow): Likewise.
	(xcoff64_is_reloc_count_overflow): Likewise.
	(xcoff64_loader_symbol_offset): Likewise.
	(xcoff64_loader_reloc_offset): Likewise.
	* elf64-gen.c: Add missing prototypes.