* aoutx.h, archive.c: Add casts to avoid warnings from SVR4 cc.

	* aoutx.h, archive.c: Add casts to avoid warnings from SVR4 cc.
	* ecoff.c, ecofflink.c, ecoffswap.h, srec.c: Likewise.
	* elf32-i386.c: Likewise.
	* elfcode.h (bfd_section_from_shdr): Make i unsigned; remove old
	#if 0 code.
	(elf_write_phdrs): Make i unsigned.
	(map_program_segments): Make i and n_left unsigned.
	(assign_file_positions_except_relocs): Make i unsigned.
	(write_shdrs_and_ehdr): Make count unsigned.
	(assign_file_positions_for_relocs): Make i unsigned.
	(NAME(bfd,elf_write_object_contents)): Make count unsigned.
	(section_from_elf_index): Make index argument unsigned.