[committed] MIPS/opcodes: Only examine ELF file structures if SYMTAB_AVAILABLE

[Maciej W. Rozycki]

Correct commit 640c0ccdc980 ("some objdump -M options, better reg 
dumps"), <https://sourceware.org/ml/binutils/2002-12/msg00706.html>, and 
only execute code setting up disassembler options based on ELF file 
structures if SYMTAB_AVAILABLE is set.

	opcodes/
	* mips-dis.c (set_default_mips_dis_options) [SYMTAB_AVAILABLE]: 
	Only examine ELF file structures here.
---
binutils-mips-opcodes-dis-nosymtab.diff
Index: binutils/opcodes/mips-dis.c
===================================================================
--- binutils.orig/opcodes/mips-dis.c	2016-12-19 09:47:48.000000000 +0000
+++ binutils/opcodes/mips-dis.c	2016-12-19 09:48:25.285678779 +0000
@@ -839,7 +839,6 @@ set_default_mips_dis_options (struct dis
       mips_cp1_names = chosen_arch->cp1_names;
       mips_hwr_names = chosen_arch->hwr_names;
     }
-#endif
 
   /* Update settings according to the ELF file header flags.  */
   if (info->flavour == bfd_target_elf_flavour && info->section != NULL)
@@ -859,6 +858,7 @@ set_default_mips_dis_options (struct dis
       else if (header->e_flags & EF_MIPS_ARCH_ASE_MDMX)
 	mips_ase |= ASE_MDMX;
     }
+#endif
 }
 
 static void