Dlltool fix - do not munge padding entries in .reloc section

[Nick Clifton]

Hi DJ,

: Looks OK to me.  I know it's not likely, but what if a reloc really
: does happen at address zero?

Well, it would have to be a reloc at address 0 on page 0.  And there
is a comment in gen_exp_file() which says:

      /* 0x0000 is an absolute relocation that should be ignored.  */
      need[on_page++] = 0x0000;

So I assume that is it OK not to munge such a reloc.

Cheers
	Nick