Don't generate RPATH if we're going to be generating RUNPATH.

need to ponder what ramifications this has before enabling it

--- binutils/bfd/elflink.c
+++ binutils/bfd/elflink.c
@@ -5382,11 +5382,15 @@
 
 	  indx = _bfd_elf_strtab_add (elf_hash_table (info)->dynstr, rpath,
 				      TRUE);
-	  if (indx == (bfd_size_type) -1
-	      || !_bfd_elf_add_dynamic_entry (info, DT_RPATH, indx))
+	  if (indx == (bfd_size_type) -1)
 	    return FALSE;
 
-	  if  (info->new_dtags)
+	  if (!info->new_dtags)
+	    {
+	      if (!_bfd_elf_add_dynamic_entry (info, DT_RPATH, indx))
+		return FALSE;
+	    }
+	  else
 	    {
 	      _bfd_elf_strtab_addref (elf_hash_table (info)->dynstr, indx);
 	      if (!_bfd_elf_add_dynamic_entry (info, DT_RUNPATH, indx))