* elfcode.h (elf_object_p): Fail if e_shoff != 0, e_shnum == 0 and

	* elfcode.h (elf_object_p): Fail if e_shoff != 0, e_shnum == 0 and
	first shdr has sh_size == 0.  Fail if e_shnum is large to cause
	arithmetic overflow when allocating the i_shdr array.
	Sanity check sh_link and sh_info fields.  Fix e_shstrndx sanity check.