binutils: fix "Bad value" error in bfd for MIPS when using -Bsymbolic.

From OpenBSD's log:

Inspired by https://sourceware.org/ml/binutils/2010-08/msg00333.html,
but expressed differently so there are no GPLv3 issues.

Obtained from:	OpenBSD (CVS rev. 1.7)
MFC after:	1 month

contrib/binutils/bfd/elfxx-mips.c

@@ -4801,7 +4801,7 @@ mips_elf_create_dynamic_relocation (bfd *output_bfd,
   /* We must now calculate the dynamic symbol table index to use
      in the relocation.  */
   if (h != NULL
-      && (!h->root.def_regular
+      && (sec == NULL || !h->root.def_regular
 	  || (info->shared && !info->symbolic && !h->root.forced_local)))
     {
       indx = h->root.dynindx;